#716 How much height does a parachute need?
How much height does a parachute need? It completely depends on the type of parachute. We need to think about how long it takes a packed parachute to be released…
How much height does a parachute need? It completely depends on the type of parachute. We need to think about how long it takes a packed parachute to be released…
Do other planets have tectonic plates? In our Solar System, Earth is the only planet with tectonic plates, but in other solar systems there will probably be planets the same…
How are memories stored? The brain stores them by altering the connections between neurons. The brains of all organisms that have them are made up of neurons, in different amounts.…
What is the difference between a frog and a toad? There are many differences between the two, although toads are actually a type of frog, which makes it a bit…
What is a jungle? It is generally an area of dense forest in a tropical climate. Many people think a rainforest is a jungle but they are different because a…
Is a force field possible? In theory, there are several possibilities, such as warping space time, electric fields, directional lasers, a controllable plasma, a magnetic field, and others. We have…
When was the first department store? It was most probably Harding, Howell & Co’s Grand Fashionable Magazine, which opened in 1796 in London. The first department store came about with…
Why do we have capital letters? Because the majority of the letters in the alphabet we use came from Latin. This question is actually the wrong way round. It should…
What is the pH scale? It probably stands for potential of hydrogen and it shows how much hydrogen is in a substance. The pH scale is written with a capital…
Why are bridges designed to move? Because they expand and contract, because the wind moves them, and because the land on either side of them moves. When you drive on…