From YouTube, "The Earth is a gigantic ball of semi-molten rock, with a heart of iron as hot as the surface of the Sun. Titanic amounts of heat left over from its birth and the radioactive decay of trillions... continue reading

posted by w1ndex 2 years 2 months ago • 354 views • 11:59

YouTube description: If you grew up watching “Sesame Street,” you know Jim Henson’s characters well. The late puppeteer brought Kermit and Ernie and so many others to life before he went on to... continue reading

posted by Aard Vark (oritteropo) 4 years 2 months 3 weeks ago • 439 views • 4:58

YouTube description: These days, giant wind turbines are supplying more and more of our clean energy. And when they break down, they need to be fixed fast. It's a job only a few people are equipped... continue reading

posted by Aard Vark (oritteropo) 7 years 11 months ago • 559 views • 5:44

YouTube Description: Imagine a mouthful of pop rocks plus Novocaine plus dandelions and you'll have an idea of what buzz buttons are like! Big in Brazil, the buzz buttons inspired us to call on our favorite... continue reading

posted by PlayhousePals 1 decade 1 year 6 months 3 weeks ago • 311 views • 5:27

A clever 'n' cute little love story told on a Möbius strip by Vi Hart, of "Doodling in Math Class" fame.

posted by FlowersInHisHair 1 decade 3 years 11 months ago • 4,761 views • 7:15