▶ Visit brilliant.org/NewMind to get a 30-day free trial + 20% off your annual subscription
@trumanhw
3 ай бұрын
I so love your writing. You may not remember me but, I'm the guy who quote your writing in your episode, _Pulling Energy Out of Thin Air_ _Without a difference in thermal states from which to establish a flow of energy ..._ _No mechanical work can be extracted from the system. (talk about elegant writing)_ Or ... the full snippet: The 1st law of Thermodynamics dictates: Entropy of an isolated system, left to evolve naturally, can never decrease ... and will always arrive at a state of thermodynamic equilibrium in which, entropy reaches its maxim. Without a difference in thermal states from which to establish a flow of energy, no mechanical work can be extracted from the system. In effect, as entropy increases, the amount of energy that can be extracted decreases. This inherent natural progression of entropy towards Thermal-Equilibrium ... directly contradicts the behavior of all perpetual-motion-machines of the second kind. SUCH beautiful writing; even hearing the second time is still stunning. I hope people don't confuse this extraordinary level of clarity nor the simplicity with which he reduces these complex concepts ... for being "easy." Those who do have really missed out on the joys of edification. But something tells me, those who've found this true gem of youtube ... know, this simply is not the quality of language heard in one's daily life.
@0neIntangible
3 ай бұрын
Not meant to dis Brilliant in any way being the proud sponsor of this, as well as many of your wonderful videos... but it might have been a humoring twist to have "Henson Shaving", or those Chinese made *"Japanese Kitchen Knives"* promos for this one.
@CoincidenceTheorist
3 ай бұрын
3:00 “…..superior to ANY stone blades”…….. hmmmm. Interesting and yet obsidian surgical blade/knives; a so called “stone age technology”still finds a place amongst present day surgeons.
@CoincidenceTheorist
3 ай бұрын
Tanum carbide. I wonder of thats a tantalum alloy.
@derek-64
3 ай бұрын
No
@dougiefresh3075
3 ай бұрын
I was kind of hoping this video was going to be more focused on the actual, physical act of cutting materials - rather than the tools that do the action.
@abarratt8869
3 ай бұрын
Agreed. Short version - all materials deform plasticly under enough pressure. The reason that a sharp tool cuts is because it is applying all the cutting force in a smaller area, so the pressure is higher. It’s the same reason rocks flow like stiff putty in plate tectonics. Deep down they’re no longer hard / brittle.
@furries123
Ай бұрын
I was thinking the same thing. It seems they got caught up on the metals and making of alloys more than the title suggests.
@samsawesomeminecraft
3 ай бұрын
misleading title, should be "The history of cutting tools"
@igorhcc
3 ай бұрын
Agreed. But it's such a good video.
@nilo9456
3 ай бұрын
Sigh, no science noted.
@patrickguyum
3 ай бұрын
Science and history go hand in hand. If the two being interlinked wasn’t deemed important, we would not be bothering with associating scientific principles, math, or technology with people, civilizations, and eras.
@liamernst9626
3 ай бұрын
@@patrickguyumagree, 99.99% of science is historical
@ghowman1
3 ай бұрын
1:13 - 2:09
@laierr
3 ай бұрын
What I expected when i clicked the video titled "The Science of Cutting": the Science of Cutting. Like Mohs scale, tool hardening, shear forces and other factors involved in cutting I'm not even aware of. What i did not expected: Brief history of metallurgy and machine tools development Was i disappointed? Hell no. I still learned a ton of details in the areas I thought I had descent familiarity with.
@ClipsByMiles
3 ай бұрын
Same expectation, different reaction. Didn’t get the science of cutting so I skipped and skipped, until I realised the whole thing was a history lesson.
@cyruswarr1192
3 ай бұрын
agreed. due to the thumbnail, i expected something more along the lines of butchering meat, cutting, trimming.. not that i mind the history lesson...albeit brief, was just not what i was expecting.
@TheRocky3613
3 ай бұрын
Almost all other videos of new mind are super specific, with tons of new information. I was indeed a little bit dissapointed. It´s still one of the better engineering channels here on youtube. Keep up the good worl!
@Redmenace96
3 ай бұрын
Me too.
@NicholasPellegrino
3 ай бұрын
Yeah was hoping for science not history. It was still interesting and enjoyable.
@matraz10
3 ай бұрын
The title of the video is covered in the first 2 minutes. Then expect a history lesson on metals and technology advancements of computers. I hit pause at 14minutes and thought to myself what then hell am I watching? There's nothing in the majority of this video about cutting, nothing at all about blade design or evolution of a blade. The only thing at this point related to actual cutting is the mention of what is rotating, the cutting tool or the object being cut. Along with how precise a cut can be made, but no mention of how that precision is achieved by a blade. But for some reason I was told what the first billion dollar company was. Why a steel manufacture needs that shout out in a video about cutting, I'm not sure. I assumed blade manufactures would have been getting the shout out. But they are ignored. I'm at 14 minutes a little past half way and couldn't tell you the science of blade design. Why some blades are flat on one side and others are angled on both sides? No clue. The angle of blade has anything to do with cutting? No clue. The actual shape of a cutting edge or how to properly sharpen a cutting edge, no clue. I started to question the video when I saw a refinery displayed while it talked about steel mills. LoL two drastically different shaped facilities and products confused. Detailed information is provided about metal alloys but not how that relates to a cutting edge along with the evolution of the lathe is provided, but no mention is given to the evolution of the cutting tools used. Just the machine itself, missing the whole point of the video
@youtubeis...
3 ай бұрын
thanks I think i'll just leave now
@KUSHALGOKHALE
2 ай бұрын
All of this is because youtube removed the unlike button...sort of.
@Kamereone
Ай бұрын
@KUSHALGOKHALE it needs an unlike button for the title. Or a flag option for misleading titles.
@Name-ot3xw
3 ай бұрын
Sharp rocks are probably our #3 all time invention. #1 being heavy rocks for hitting things and #2 being fire.
@superchuck3259
3 ай бұрын
Sharp sticks. See if you fire harden the point, a smart human can make pointy sticks that can take on bears/lions/etc. A group of people with pointy sticks to protect themselves will be safe from those predators. Or if people want to, then can become the top predator!
@BillSmith-fx7xx
3 ай бұрын
This is a new one on me ! You can actually make the point of a stick harder with fire ? Does it give up any sharpness ? A harder tip might be worth a little trade off ?
@jessicaheger1880
3 ай бұрын
What about the wheel?
@sirlaser8177
3 ай бұрын
I thimk the wheel needs a place
@ParagonPKC
3 ай бұрын
no wheel or string??
@sambolino44
3 ай бұрын
My grandfather was a toolroom machinist in a paper mill, my dad had started as a machinist in the Navy and went on to design paper bag machinery. I once found a small sculpture of an eagle that my cousin had made. At dinner one night I (probably around ten at the time) marveled at how he had carved that eagle out of aluminum with an X-Acto knife; until then I had no idea that cutting something as hard as metal was possible. My dad responded, "What do you think we do all day?" Years later I came up with the snappy reply, "How would I know? You never talk about it." I guess this story has more to do with family dynamics than cutting technology. I went on to become a machinist and tooling designer myself, BTW.
@dickJohnsonpeter
3 ай бұрын
You can't cut aluminum with an exacto knife so what do you mean?
@noonenoesbutme
3 ай бұрын
As the lead mechanical design engineer for a large tech company, this video gets me GOING. On the machine screw level I can tell threads by eye. What amazing history lead to what I use. I can take surface to edge angle / distance, plane to plane measurements and validate fasteners for use with a couple clicks using CAD. What a time to be alive :)
@kritikatura
3 ай бұрын
Fortunately, I lived through these changes. Truly incredible progress has been made with the entry of computer technology into this profession. I started CNC programming on a small EMCO cutting machine. Today, knowledge of PLC codes is not required in many places. We sharpened the tools while holding them in our hands, now machines do this for us as well. I'm programming sharpening machines like this now. :) :)
@Ghozer
3 ай бұрын
The Bessemer process was invented (and first used) in my city!! :D (Sheffield, UK) Stainless was also invented here :) as well as Crucible steel!
@multirole240
3 ай бұрын
Spot on. Lets get the history right.
@velkoto1
3 ай бұрын
Yet another great video by one of the most underrated science channels on KZitem. Thank you!
@SillySpaceMonkey
3 ай бұрын
Watched at 5x speed, eh?
@CR-un7wl
3 ай бұрын
613k subscribers, and sponsored. Not sure about underrated lol. Either way it's good introduction to the basics of material properties in regards to cutting. Good stuff
@eve_squared
3 ай бұрын
one of the things that solidified how cutting metals worked for me was using a cold cut saw (not the meat) which had a carbide toothed blade about a quarter inch thick. it spun slow with coolant and was a beast of a machine. It was loud as hell too, so I didn't want to go too rough on it but my boss said I was wasting money not being aggressive with the saw since technically it's taking less cuts and wears the teeth out less.
@BASE5NYC
3 ай бұрын
As a guy that's carried a pocket knife every single day for the last 25 years & owns probably 30 of them.. this is incredibly interesting.
@photodoc100
3 ай бұрын
10 of of 10 presentation. Teaching and the history of sharp strong cutting tools. As a ex-Butcher the knife blade edge was very important.,if the blade edge was to sharp eg 11 degrees the knife would become blunt very quickly,if the edge was 25 degrees or more it would make for hard work boning and cutting. Between 20-22 degrees was just right. We were told at college that you never cut yourself with a sharp knife.the blade cuts and flows in the direction you are cutting but a blunt knife has to be forced and can result in changing direction with potential to cut you.growing up in the trade a man at a butcher shop near me was boning a beef chuck and the knife slipped and went straight into his thigh,he died right there were he was working.😢 Thank you 👍🏼 Australia
@chrissorensen9511
3 ай бұрын
I teach engineering students in a machine shop. You have just added content to my mill and lathe classes. You WILL be credited and I will steer students to this video for a deeper dive. Well done.
@ericlotze7724
3 ай бұрын
The Legend has blessed us with another Episode!
@copperlemon1
3 ай бұрын
You kind of skipped over cam drive, relay control, and pantograph in the lead up to CNC, though it's only tangential to the main topic.
@Southpawarsenal
2 ай бұрын
As someone watching this video while also operating a CNC machine, I feel honored and thankful for everyone involved in getting us here. I wouldn’t have this job without them.
@IkarimTheCreature
3 ай бұрын
You are making me psychotic man! Every interest I pursue, either leads to one of your old videos, or you upload one while i'm pursuing it. And always being the highest quality. I'm glad I stuck around since the beginning of this channel!
@cooldude360180
3 ай бұрын
As a general machinist myself, i love seeing these deep dives into the history and processes of industry.
@CRAiCED.
3 ай бұрын
Toolmaker & CNC programmer here for pharmaceutical and aerospace companies. This was an awesome watch thank you!
@LousyBlowfish
3 ай бұрын
11:32 "...could cut a 1m bore to an accuracy of 1.5..." my machinist brain thinks 1.5 thousands of an inch? 1.5 microns??? "...millimeters." Actually lol'd at that. Its crazy how quickly our machine tools advanced in accuracy and precision
@benchicoine2949
2 ай бұрын
An episode describing how a knotter works on a hay baler would be super interesting.
@James-rx5eb
3 ай бұрын
Videos like this are awesome. Understanding micro-mechanics of common phenomena is great. Stuff like: cutting/shearing, tip deflection, friction
@einundsiebenziger5488
3 ай бұрын
Would love to see a more in-depth history of the beginnings of metallurgy. Most certanly wasn't there one person who on day said "let's build a furnace, mix copper and zinc and create bronze". How did people come up with melting stones, so metal would come out of them? How did they discover the different properties of different metals and how did they manage to mix (alloy) them so they'd enhance each other properties thousands of years before chemistry became an actual science with methodical proceses?
@tanswork2025
3 ай бұрын
Worth an entire college semester.
@SuperYellowsubmarin
3 ай бұрын
Which college did you attend ?
@tanswork2025
3 ай бұрын
@@SuperYellowsubmarin Engineering Mechanic
@rb26DETTn
3 ай бұрын
Great video, very informative but the title is very misleading, half the video was metallurgical history
@aakashgupta2711
3 ай бұрын
Re-upload?
@robitussin7616
3 ай бұрын
Cast Iron is Iron with a Carbon content between 2.06-6.8% Carbon (but only really usable until 5% Carbon)
@richardpowles-brown2775
3 ай бұрын
Thanks for the video, unofrtunately there are so many adverts from KZitem - is there another platform we can watch this content on?
@Matthews_Media
3 ай бұрын
Thank you so much for all your hard work making this video. Truly high quality content. 15 years ago the only place to learn anything like this was at university. Just amazing what I am able to learn in the comfort of my own house.
@freecake1
3 ай бұрын
I have been watching your channel since the science of roundness and I always forget exactly how good your videos can be! lmao. When I clicked on this I did not expect an overview of this depth of the topics covered in both my materials and manufacturing classes in uni. Have you tried targeting the struggling mech E students yet?? A ton of students use youtube for help with course work/material and I do wonder how you would approach a video dedicated to material in a college level course. (like heat transfer or applied thermo). Love these vids! This, flatness, roundness, of course the more ME focused vids have been my favorite so far.
@Redmenace96
3 ай бұрын
I learned a few things! Great YT vid. One thing I have to say is that for the last 40 years people have said that the U.S. doesn't manufacture anything. We make the finest, and most expensive machine tools known to man. They ain't cheap. China sends more material and goods to us, by volume/mass. We send the most advanced and best equipment the other way. By cost/value? We export more than we import. Same with India/Egypt/Brazil... what have you.
@leandroalfonso3096
3 ай бұрын
a better title could have been "the science and history of cutting". great vid, pretty interesting
@RichardAllen7753
3 ай бұрын
This channel is amazing. They take a totally mundane topic and make it fascinating. Thank you!
@wynetsang
Ай бұрын
The Metal Age not just gave human sharp formed object but sharpen the mind of human which evolve into extreme mind [idealism].
@samsaek666
3 ай бұрын
Love how these usually start at the EARLIEST possible use of this tech
@woodworkingandepoxy643
3 ай бұрын
As a woodworker I found this really interesting. Great video
@RYUzakiisLight
3 ай бұрын
Idk if I’m thinking of another channel with a similar style/content but is this a reupload ?
@dragonamp2
3 ай бұрын
I have had the same question while watching this.
@3dkiwi920
3 ай бұрын
The 1st notable Metal Turning lathe with toolpost and prismatic ways, was designed and built by Jacques Vaucanson, 1751.
@RGD2k
3 ай бұрын
The machine that makes a machine tool different from any other is the use of the screw to precisely control the application of the cutting edge to the work. It's really that and not the application of power. A power tool isn't necessarily a machine tool. A machine tool can be human powered and still be a machine tool. If you have to turn a wheel to make a cut happen, it's a machine tool. If you have to push to directly move an edge to make a cut happen, it isn't. It's that the cut is constrained, guided by a way, and fed by a screw or lever (which themselves are basic machines) which makes a machine tool such. A woodworking lathe where you apply a chisel you hold in your hand to a spinning workpiece isn't a machine tool, but it is a power tool. An electric drill you aim by hand also isn't a machine tool, neither is a router you aim and move about by hand. A screw cutting lathe is, a mill is, even a pedestal drill is (although barely, because it has a quill you lower by turning a wheel). CNC machines of course all must be, but so too must the 'power feed' axies which a mill or lathe might have. But it seems too often people equate 'machine' with 'has power from other than a human', and it just isn't so. A lever is a machine, so is a ramp or wedge, and the latter wrapped around a rod makes a screw thread, which is really just a fancy inclined plane which allows rotation to make controlled linear motion along the rod. That being used to change the position of a cutting tool, whilst another axis spins it, is what a screw-turning (metalworking) lathe is. It's not the spinning-ness of the work - it's the controlled positioning of the cutting edge.
@peterbabu936
3 ай бұрын
This is cutting edge technology
@srgkzy1294
3 ай бұрын
You have no idea how much time I had been looking out this topic in my life !! thx for all the info I didn't know
@seanglynn8971
3 ай бұрын
Thank you for saving the AD until the end 👍🏻👌 you just got my sub.
@dameanvil
2 ай бұрын
- 00:00 🧠 Cutting tools are fundamental to human progress, enabling the transformation of raw materials. - 00:40 🪓 Early humans used stone tools like choppers for cutting meat and creating advanced tools. - 01:16 🔪 Cutting involves applying a directed force, requiring the tool to be harder than the material. - 02:10 🛠 The transition from the Stone Age to the Bronze Age brought the use of metal tools, starting with copper. - 03:06 🧬 Metallurgy emerged in the Bronze Age, allowing for the creation of alloys and manipulation of metal properties. - 05:00 ⚒ Bloomery furnaces allowed the processing of iron, leading to the development of wrought iron. - 07:09 🔥 The blast furnace further advanced iron processing, leading to large-scale production of pig iron. - 09:04 ⚙ The Bessemer process revolutionized steel production by efficiently reducing carbon content in iron. - 11:00 🏭 Machine tools evolved from simple hand tools to complex machines, enhancing precision and efficiency. - 13:28 🖥 CNC (computer numerical control) machines automated production, achieving high precision and repeatability. - 14:39 🔧 High-speed steels, introduced in 1910, withstood higher temperatures and cutting speeds, advancing tool performance.
@fightwithbiomechanix
3 ай бұрын
You made the mechanical engineer and metallurgists very happy 😁
@sihane10
2 ай бұрын
By 7:56 you say low carbon, but cast iron is a high carbon alloy. You have said this before so i thought it better to mention.
@RoboArc
3 ай бұрын
I have a gigantic 3D printed CNC i desgined, so this was fun to watch 🙃 i can cut wood, plastics, aluminum, brass, amd copper. Its really cool to see how far we have come and how fast we are moving.
@kdmerkle
2 ай бұрын
Fascinating! At 21:30 there is an impeller being CNC machined. Do I recall correctly that this is a Space Shuttle part and is thought to be among the most complex parts ever to have been machined? Do you have references to this particular process?
@nancyhope2205
3 ай бұрын
Loved the video. I didn’t know what I was getting into and it has been illuminating. Thank you.
@jackofnotrades4350
2 ай бұрын
missleading thumbnail, i thought I was going to learn the science behind cutting with/against the grain of steaks and cooking techniques
@Platypus_Warrior
3 ай бұрын
4:36 that's obsessive looking to me. I love it !
@tectzas
3 ай бұрын
I was so enamored by the history of metal alloys that I forgot this video was about cutting until about the 10:40 mark. Great video. I'd love to see a game that incorporates such a granular progressions through metallurgy. Going from stone tools to copper to bronze to iron to pig iron to cast iron to steel to high speed steel.
@MiD218
3 ай бұрын
Maybe not what you'd expect, but LOTRO has a system like that. From mining the ores, to smelting them with coals and such, to mixing the metals and making armours, tools, weapons etc.
@tectzas
3 ай бұрын
@@MiD218 Really? I'll have to check it out
@MiD218
3 ай бұрын
@@tectzas Yeah, besides me being a Middel Earth fan, that crafting system is a good chunk of why I like the game haha. You can check the LOTRO wiki to read all about how the crafting system works.
@fakebobbyhill296
3 ай бұрын
I almost got killed by a lathe once. Even if it’s -40 degrees Celsius outside, and the shop you’re working in is an old miner’s barracks with holes in the walls so it’s around -10 in the shop… never let down your sleeves.
@deathsmileyinc
3 ай бұрын
Id argue cutting was discovered by beaks, teeth and claws
@Ctrlaltdelsean
3 ай бұрын
I would argue it was discovered by angsty teens. Perhaps it was discovered separately depending on definition and use then.
@nuvnsrp
2 ай бұрын
it is improper to say cutting shear force. any cutting has to start with high crushing stress otherwise the sharpness of the tool becomes unimportant. if only shear stress is important to cut, one can cut with blunt tool (other edge than sharp edge).
@paulcooper8818
2 ай бұрын
1:10 Poor early man, having to hobble around like that, before discovering how to walk upright .
@DominikPinkas
3 ай бұрын
At work, we use solid diamond knives to prepare amd collect resin sections with repeatable thickness of tens of nanometres. But it looks way less cool than it sounds.
@billynomates920
3 ай бұрын
i was going to watch this but autoplay said: history guy - the history of superglue. the videos make a good doublet, especially considering their introductions. 😊
@RobertLBarnard
3 ай бұрын
Some animals have various cutting capabilities, and animals even use tools. But what differentiates human from other animals is our ability to use stared energy. Stored energy, such as fuels for burning like wood and oil helped keep us warm, cooking food (making it more edible), and do metal work.
@adcaptandumvulgus4252
3 ай бұрын
Whoever was experimenting with alloys and decided to risk using rare aluminum to make aluminum bronze was super lucky because that's almost as good as steel in a lot of properties , plus gold look would be popular too, I bet.
@abhishekjadhav847
3 ай бұрын
Great video as usual. Please make video on evolution of (or Science of) precision measuring tool and machines
@plibani4248
3 ай бұрын
MISLEADING TITLE. Hey Bruno, if the title your video is "The Science Of Cutting", you talk about the science of cutting, NOT about some other subject like the history of metallurgy or cutting tools or whatever. MISLEADING TITLE.
@Cryzophylax
3 ай бұрын
You cannot talk about cutting without going over the tools and therefor materials needed for cutting.
@thrawjive
3 ай бұрын
This is absolutely fantastic!
@geemy9675
3 ай бұрын
the weird thing about machining is removing huge amounts of material but layer by layer while water jet, plasma, edm can cut big chunks very precisely in one go. machining is still useful to make concave shapes, but if you can make the convex shaoe that's rhe closest to you final part and only then machine the concave part, it siund like you can save lot ot time, znergy and wear on the tools ? 3d printing/additive technologies are very interesting but I dont think its anywhere ready for mass prooduction of parts, neither in terms of quality, precision or speed.the only exception is when the more complex shapes allowed by additive technologies enable new features. I have 3d printed soles in a pair of addidas, I like the looks but I wouldt say it makes such a big difference each technique having its advantages, I think not a dingle one is going to disappear soon but by combining them manufacturing is going to keep improving. where 3d printing take things ro the next level is 3d printing things on site that cant be moved easilyy like 3d printing houses or sending a self replicating 3d printer on another planet to start naking the building blocks for a civilization
@krzysztofsoja5301
3 ай бұрын
Great video - as always! Thank You!
@mkkd85
3 ай бұрын
Excellent video, thanks!
@hvanmegen
3 ай бұрын
Fascinating video, as always.. thanks, I've learned a few things today!!
@blurglide
3 ай бұрын
Wow- this is like 1/3 of my materials science 101 class, minus the math.
@OGSontar
3 ай бұрын
Fascinating! Just imagine the new metals and materials we'll see once we begin to mine asteroids. Pity I won't be around to see it, but our kids and grandkids very likely will.
@chrissmith2114
3 ай бұрын
The melting point of copper is about 200deg C below steel but I would hardly call 1000 deg C ' a low melting point'...
@erik_stein
3 ай бұрын
You got the emphasis on the wrong syllable... The 'N' in CNC, "Numerical" is pronounced as nu-mer-i-kal, not noom-ra-kal. Otherwise, nice work! I enjoyed this one 👍
@SolarMillUSA
3 ай бұрын
@6:13 “know as a Blue Murray”
@randyjohnson3654
3 ай бұрын
As a machinist this is peak for me
@Uranus-420
3 ай бұрын
8:45 you just read out a Wikipedia paragraph. it's kinda disappointing
@stevenbodo965
3 ай бұрын
I saw the thumbnail pop up and I was like YEAH!
@1kreature
3 ай бұрын
Then I watched it and did not see the clip from the thumbnail and was pissed!
@ObiWanCannabi
11 күн бұрын
we sailed thru the metal age into the modern ceramic age
@Srinathji_Das
2 ай бұрын
Excellent video! 👍💛
@ThomasRonnberg
3 ай бұрын
Very well made video.
@ChainsawFPV
3 ай бұрын
Good morning all!
@yash1152
3 ай бұрын
4:31 how is this recorded?
@Nosliw87
3 ай бұрын
This is my biggest fear. I haven't watched this video but. I'm saving it for when i can watch it
@shanerorko8076
3 ай бұрын
I haven't watched this yet, but I still haven't been explained why, cutting a brake rotor on an ammco does not produce the same finish of a the original machine? Yes I know that the ammco style system uses negative rake, but surely the finish can't be that dissimilar. Is it due to the heating and carbon disposition into the iron?
@robertpanienka7008
3 ай бұрын
interesting topic and nice video. thanks
@lalad0
2 ай бұрын
Taking notes in case I get sent back in time
@conradkai9705
3 ай бұрын
3:02 The Bronze Age? Yeah I know him! He plays for the Lakers, right?
@elliotlea5457
3 ай бұрын
7:55 Cast iron has a higher carbon content than steel so it isn't really "low carbon"
@lint2023
3 ай бұрын
Very interesting.
@MrJesseFisher
3 ай бұрын
This was fascinating but you missed covering when we invented sliced bread
@TestUser-cf4wj
3 ай бұрын
A bone to pick. Before the bronze age and after the stone age was the copper age. Copper actually overlaps the stone age because copper can be found naturally in it's elemental form as native metal. Further, copper can be refined from ore using stone age materials. The development of alloys necessarily had to come _after_ the development of ore refining.
@einundsiebenziger5488
3 ай бұрын
... in its* (it's = it is) elementary* form
@SeanBeyond
3 ай бұрын
I’ve found my calling. I’ve been feeling like looking into a trade such as plumbing or electrical work and since 2017 I’ve been working in the restaurant industry numerous positions but after coming across this video it reminded me Metal working is in my blood 🩸 my last name is Ferraro meaning blacksmith in Italian. My grandfather worked on airplanes and was a mechanic for General Motors and my father was a hippie
@cockroachenjoyer
3 ай бұрын
i was coming here thinking "hrmm, psychology?" and ended up learning about the history of cutting tools
@brianmoore1164
3 ай бұрын
It's a completely fantastic video, but I am not sure you chose the correct title.
@dickydoes
3 ай бұрын
I thought you said ‘chipping away at a pebble with a hamster’. Had to rewind that.
@aaax9410
3 ай бұрын
What a fantastic history thanx man :)
@ResidentNetizen
3 ай бұрын
Your inflection dips at the end of every sentence. Stop that. Otherwise, great stuff! Subscribed.
@matheussteinmetz
Ай бұрын
cutting-edge science
@Max_Marz
3 ай бұрын
Machinist for ten years, let’s see if I learn something
@anonymousOrangutan
3 ай бұрын
well, did you?
@ku0n-zo5uf
3 ай бұрын
2 entire university semesters shown in 20 minutes. Nice :)
@adammcg5
3 ай бұрын
Thanks
@lucaskelley3418
2 ай бұрын
All of this evolution just for me to cut my fingers on a carbide end mill stuck in the shank
Пікірлер: 796