How can common table salt blow up a fish tank? Watch as the Backyard Scientist uses molten salt and water to explosive effect! Please note: Do not try this at home! (And if you do, wear gloves and safety glasses.)
Check it out as Physics Girl helps you figure out how to turn sand into a liquid–using air!
Watch as the former Fresh Prince makes the ultimate long-distance call! (See also: How many old-school references can we make in one sentence?)
Concrete is one of the most ubiquitous materials that make up our cities, but few outside of civil engineers give it much thought. Here, from Practical Engineering, is a short and interesting take on the basics of concrete mixing.