#710 When was the first department store?
When was the first department store? It was most probably Harding, Howell & Co’s Grand Fashionable Magazine, which opened in 1796 in […]
#709 Why do we have capital letters?
Why do we have capital letters? Because the majority of the letters in the alphabet we use came from Latin. This question […]
#708 What is the pH scale?
What is the pH scale? It probably stands for potential of hydrogen and it shows how much hydrogen is in a substance. […]
#707 Why are bridges designed to move?
Why are bridges designed to move? Because they expand and contract, because the wind moves them, and because the land on either […]
#706 Why do we sneeze?
Why do we sneeze? We usually sneeze in order to remove an irritant from the nose. There are many different things that […]
#705 Why do many Americans drink coffee and many British people drink tea?
Why do many Americans drink coffee and many British people drink tea? Because Americans boycotted tea before, during, and after the War […]
#704 Why does iron rust?
Why does iron rust? The iron atoms react with oxygen molecules to produce iron oxide, which is rust. Other metals don’t rust […]
#703 Is a starfish a fish?
Is a starfish a fish? No, starfish are not fish. Fish are vertebrate animals that live in the sea, have gills to […]
#702 Why is mercury poisonous?
Why is mercury poisonous? It can damage the nervous system, kidneys, liver, and immune systems of people and animals. Mercury is a […]
#701 Do all liquids expand when they freeze?
Do all liquids expand when they freeze? No. Water is the only liquid that expands when it freezes. There are four states […]