#650 Why is 0 longitude in London?
Watch on Youtube Why is 0 longitude in London? It was used by more than two-thirds of the world’s ships and the […]
#649 How much wind does a wind turbine need?
Watch on YouTube How much wind does a wind turbine need? A wind speed of roughly 11 km/h. Wind power has been […]
#648 When did cave paintings first appear?
Watch this on YouTube When did cave paintings first appear? The oldest cave painting found so far is from 50,000 years ago […]
#647 How does a 3D printer work?
How does a 3D printer work? There are four different methods of 3D printing. Fused deposition modeling, stereolithography, digital light processing, and […]
#646 Why are deserts cold at night?
Watch on YouTube Why are deserts cold at night? The sand reflects the heat up and the air cannot hold the heat […]
#645 How quickly do bones biodegrade?
Watch on YouTube How quickly do bones biodegrade? It depends on what kind of soil they are buried in, but from 6 […]
#644 How does an iron remove wrinkles from clothes?
Watch on YouTube How does an iron remove wrinkles from clothes? The heat forces the cellulose chains to lie straight. People started […]
#643 What makes things sticky?
Watch on YouTube What makes things sticky? When the molecules in two substances are attracted to each other things become sticky. The […]
#642 When did people start wearing wedding rings?
Watch on YouTube When did people start wearing wedding rings? Wedding rings have been found dating back as far as 4000 BC. […]
#641 Why is carbon-based life common?
Watch on YouTube Why is carbon-based life common? Because carbon can bond with many different elements to allow chemical reactions to happen. […]