The Daily Mail, an appallingly bad British newspaper, published a list of questions that parents struggle to answer from their children. The survey it was from is unnamed, but it claimed to have asked 2,500 parents. This image from the article summarises them:
I’ve had a go at giving some answers, but they aren’t detailed answers. Unanswerable questions and ‘Where do babies come from?’ are ignored. The latter merely because it isn’t hard to answer, just awkward.
How is electricity made?
A common way is as follows: Get some sort of wheel to move. This could be a water wheel, or it could be from evaporated water from burning coal or from a nuclear reaction. The wheel then rotates a wire around the magnet (or rotates the magnet instead). When an electrical conductor cuts a magnet (when it is moving perpendicular to it) an electrical current is generated.
What are black holes?
Black holes are things in space that has such a strong gravitational pull that not even light can escape from its gravitational field.
What is infinity?
Maths is free, infinity is whatever you want it to be 🙂
Why is the sky blue?
Some light is absorbed by particles in the sky before it reaches our eyes. Light of all wave lengths is emitted from the Sun, but those with a smaller wavelength are absorbed more. Blue has the least wavelength of all, and so it gets absorbed the most. It then gets re-emitted in any direction. As you can see blue light from any angle, the sky looks blue.
So the sun itself looks like the colours that are left: Red and Green. Red and green light together looks yellow.
Why do we have a leap year?
A day is 24 hours and there are 365 days in a calendar year. The problem is that in a solar year there are actually about 365.25 days. Thus every four years an extra day is added in order to sync the calendar and the solar position together, so that seasons fall at the same time every year.
In fact, it is a bit less than 365.25 days for a solar year, and so some leap years are ‘missed out’.
How do birds/planes fly?
By the upward force caused by air moving under their wings, and the forward force eventually caused by the air flowing over its wings.
Why do onions make you cry?
When you cut up an onion, you let various chemicals in it mix together. They react to form a particular chemical that can react with the water in your eyes to create sulphuric acid, which burns your eyes! So when the chemical gets in the air and gets to your eyes, it stings, and so your body releases more tears in order to protect your eyes.
Where does the wind come from?
Air on the earth keeps getting heated up, or cools down, for various reasons. When air cold air and hot air are next to each other one moves above the other and winds are formed.
Why is the sea salty?
It comes from eroded rocks in the sea and in rivers that feed the sea.
How big is the world?
One way of finding this out is assuming it is a sphere and measuring the curvature. You find out the diameter is about 8,000 miles. You can work out from that it is about 25,000 miles to go around. You can also work out that it is about 200 million square miles.
Britain is about 95,000 square miles, and so the earth is 2,000 times the area of Britain.
What is a prime number?
It is a positive whole number such that only itself and 1 are divisors. 1 is not counted as a prime number.
They are important as every number is the product of prime numbers in a unique way.
What makes thunder?
The lightening heats up the air around it very quickly. As it moves away, it makes the thunder noise.
Why do we blink?
To keep them from becoming dry and also to try and prevent bits of grit getting in them.
Where does water come from?
Water is not really used up (in general), and so we just keep reusing the water that has always been on earth.