#342 When was shampoo invented?
When was shampoo invented? It was invented in India in about 1500. Our hair gets dirty because we secrete an oil called sebum which protects the structure of the hair…
When was shampoo invented? It was invented in India in about 1500. Our hair gets dirty because we secrete an oil called sebum which protects the structure of the hair…
How does a parachute work? A parachute works because of air resistance. If you jump out of an airplane, presuming you are high enough, you are going to accelerate until…
How much blood can you lose? Well, obviously all of it. How much blood can you lose and still function? Depending on your body size, from between 15 to 30%.…
Why do we say boycott? The word comes from a British land agent who lived in Ireland. His name was Captain Charles Cunningham Boycott. He was born in England in…
When was the Roman forum built? In the 7th century BC. The beginning of the Roman forum is difficult to get a grip on because the Romans liked to embellish…
Why is PM 2.5 dangerous? They are particles that are too small for our nose to catch. PM stands for Particle Matter and they are microscopic solid or liquid particles…
Why are diamonds so expensive? Because we believe they should be expensive, not because they are rare. We think that diamonds are expensive because they are rare, but they are…
Why did the Mayan civilization collapse? Probably because of overpopulation, environmental damage, war, and extended drought. The Mayan people lived in an area that is where southeastern Mexico and northern…
When was the penny first used? The first coin to be called a penny was in 790, but the word meant “all money” and not just one coin. There are…
How do fossils form? They form when the bones of an animal are turned to mineral. A fossil forms when an animal dies in water or falls into water. This…