#534 What happened to biplanes and triplanes?
What happened to biplanes and triplanes? They produce too much drag, which means they can’t fly fast enough and they use a lot more fuel. The first planes built were…
What happened to biplanes and triplanes? They produce too much drag, which means they can’t fly fast enough and they use a lot more fuel. The first planes built were…
Why is Greenland part of Denmark? Greenland was a colony of Denmark, but it didn’t officially become a part of Denmark until 1953. It is technically defined as a district…
Why are clouds at different heights? It depends on the temperature and the pressure of the air. Clouds start when water vapor evaporates off the surface of the Earth into…
How do some animals walk up walls? They do it thanks to either tiny hairs on their feet or sticky pads. Animals that can walk up walls tend to divide…
What is hyperthermia? It is an abnormally high body temperature. The average body temperature is between 36.5 ˚C and 37.5 ˚C. Under 35 ˚C and you have hypothermia. Between 37.5…
Is a photographic memory real? It has never been conclusively proven, but there are some people who come close. Memories are vital evolutionarily. They let us know who is in…
Why do insects have an exoskeleton? To stop them drying out, for protection, for support, and to help them sense their surroundings. An exoskeleton is a hard skeleton that covers…
Why are there 12 signs of the Zodiac? Because the Babylonians decided that there should only be 12. What are the signs of the zodiac? The signs of the zodiac…
Why do eyes get worse with age? It happens because the lenses of the eye become less flexible and it becomes difficult to focus the light. How does the eye…
When did people start using flushing toilets? It was invented in 1596, but didn’t start to become common until the 1850s. People have used toilets for thousands of years, but…