Metals have a crystal structure. But they're not one big crystal, they're lots of small crystals called grains. The size of the grains affects the physical properties of the metal, like hardness, toughness,... continue reading

posted by newtboy 3 years 5 months ago • 135 views • 8:45

I'm dreaming of a white Christmas [no I'm not] YouTube: This episode Nellie Benner snorts a white crystalline powder: Cocaine. The active substance is cocaine hydrochloride and has a stimulating effect... continue reading

posted by PlayhousePals 8 years 2 months 2 weeks ago • 318 views • 10:35

YouTube: Stained glass is thicker at the bottom - so is it a liquid? Earth's mantle enables plate tectonics, so is it a liquid?

posted by PlayhousePals 9 years 5 months 2 weeks ago • 471 views • 7:02