#337 Why is PM 2.5 dangerous?
Why is PM 2.5 dangerous? They are particles that are too small for our nose to catch. PM stands for Particle Matter […]
#336 Why are diamonds so expensive?
Why are diamonds so expensive? Because we believe they should be expensive, not because they are rare. We think that diamonds are […]
#335 Why did the Mayan civilization collapse?
Why did the Mayan civilization collapse? Probably because of overpopulation, environmental damage, war, and extended drought. The Mayan people lived in an […]
#334 When was the penny first used?
When was the penny first used? The first coin to be called a penny was in 790, but the word meant “all […]
#333 How do fossils form?
How do fossils form? They form when the bones of an animal are turned to mineral. A fossil forms when an animal […]
#332 Do cyanide pills kill as quickly as in the movies?
Do cyanide pills kill as quickly as in the movies? Perhaps. If it is the right kind of cyanide, it can kill […]
#331 What is the opposite of white?
What is the opposite of white? Either black or transparent. Let’s look at what colors are, what white is, and what black […]
#330 Can we cover the Sahara Desert in solar panels?
Can we cover the Sahara Desert in solar panels? Technically, yes. Practically, no. The Sahara Desert is the largest hot desert in […]
#329 Why does popcorn pop?
Why does popcorn pop? Pressure builds up as the water in the kernel heats up until it explodes. People have been eating […]
#328 Why do we get hot when we exercise?
Why do we get hot when we exercise? Because heat is a byproduct of the process muscles use to make energy. Let’s […]