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History of Technology Videos 160 videos

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History of Technology 2: Wheels
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How did people move stuff around before the wheel was invented? More importantly, why didn't they take a break for a few minutes from moving stuff...

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History of Technology 1: The Story of Coal 100 Views


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Description:

When you're counting the chunks of coal in your stocking on Christmas morning, do you ever wonder where it came from? No? Okay, look...it's this attitude that got you coal for Christmas in the first place.

Language:
English Language

Transcript

00:00

right back in you'll hear a tale a tale of coal well

00:08

yeah it didn't sound exciting to us either that's why we spiced it up with [Book titled the story of coal]

00:11

some Gilligan's Island love I know we got your attention the story of coal

00:15

here's mother nature's recipe for coal oh and uh we're on good terms with her [Mother nature holding 2 plates of coal]

00:20

so well she didn't mind sharing it with us already cold forsake of swampy

00:24

forests the swampy er and mucky or the better for extra zip at a hearty dollop [Dinosaur in a swamp]

00:29

of green slime now cover all that slimy swampy goulash with dirt that's right [Chef holding a bowl of green slime]

00:35

good old-fashioned dirt layers and layers and layers of it wouldn't

00:38

recommend serving this at potluck any kind of spoon well now that we have our [Sous-chef adding dirt to the bowl]

00:41

sludgy swampy goop pressed under massive amounts of soil we only have one final

00:46

step well let's let it all stew in its own juices for a few million years okay [Chef with a long grey beard]

00:53

we didn't say it was a quick recipe and it's usually not great for potluck well [Skeletons sat round the restaurant table]

00:56

the process of decay that produces coal is called carbonization this is because

01:02

time and pressure are concentrating all the forest carbon into black carbon rock

01:07

because it's nearly pure carbon coal has very high energy density if we took a [Coal being burnt]

01:13

chunk of coal and a piece of wood and set them on fire the coal would release

01:17

three times as much energy its Mun would step up your game however not all coal [Guy sets the 2 alight and gets a black face]

01:21

is created equal there are lots of different types of

01:24

coal with the most important being bituminous an answer asite well the two

01:30

minutes coal has a lower carbon content and a lot more junky dirty stuff mixed [Smoke pouring out of a factory chimney]

01:34

in answer a site on the other hand is the purest kind of coal so it burns to

01:39

clean it and have the most potential energy you can think of the cumin of

01:43

coal as watering gas station coffee and the anthracite as freshly brewed double

01:48

shot espresso or meant that in the best way possible we love watery gas station [Two women sat in a garden drinking coffee]

01:53

coffee yeah it's like that water and diesel

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