Why don't perpetual motion machines ever work? - Netta Schramm

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Perpetual motion machines — devices that can do work indefinitely without any external energy source — have captured many inventors’ imaginations because they could totally transform our relationship with energy. There’s just one problem: they don’t work. Why not? Netta Schramm describes the pitfalls of perpetual motion machines.

Lesson by Netta Schramm, animation by TED-Ed.

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The Infinite Hotel Paradox - Jeff Dekofsky

The Infinite Hotel Paradox - Jeff Dekofsky

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Want more? Try to solve the buried treasure riddle: https://www.youtube.com/watch?v=tCeklW2e6_E

The Infinite Hotel, a thought experiment created by German mathematician David Hilbert, is a hotel with an infinite number of rooms. Easy to comprehend, right? Wrong. What if it's completely booked but one person wants to check in? What about 40? Or an infinitely full bus of people? Jeff Dekofsky solves these heady lodging issues using Hilbert's paradox.

Lesson by Jeff Dekofsky, animation by The Moving Company Animation Studio.
Stirling Engines - the power of the future?

Stirling Engines - the power of the future?

Stirling engines are having a bit of a revival. What are they, and how do they work? Could they generate our electricity in the future?
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I like machines that show their workings. You can see all the parts of a stirling engine doing their jobs. Stirling engines are simple, but use a principle that may be unfamiliar to many viewers. One thing that you have to remember from your science classes is that gases expand and contract very rapidly indeed, making this sort of engine practical.

Stirling engines are not very powerful nor do they have great power to weight ratios. I know of one annual boat race that takes place in England on a river using stirling engines, and it is somewhat sedate.

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Top 10 Biggest Tech Flops

Top 10 Biggest Tech Flops

New is not always better and these products are proof of that. Join http://www.WatchMojo.com as we count down our picks for the Top 10 Biggest Tech Flops. Suggestion Tool►►http://www.WatchMojo.com/suggest Subscribe►►http://www.youtube.com/subscription_center?add_user=watchmojo Facebook►►http://www.Facebook.com/WatchMojo Twitter►►http://www.Twitter.com/WatchMojo Instagram►►http://instagram.com/watchmojo Channel Page►►http://www.youtube.com/watchmojo

For this list, we're looking at gadgets and gizmos that failed to garner consumer attention or demand, and, as a result, became a commodity fail for the brands that designed them.

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MythBusters- Folding  Paper Seven plus times

MythBusters- Folding Paper Seven plus times

MythBusters- Fold Paper Seven Times!