1) The largest insurance market in the world is Lloyd's of London, which is not an insurance company but a market where insurance brokers and underwriters come together.

2) The Northern Lights, also known as the Aurora Borealis, are natural light displays that occur in the polar regions due to interactions between the Earth's magnetic field and solar particles.

3) Cows have best friends and can become stressed if they are separated.

4) The first photograph of a black hole was captured in 2019 using a network of telescopes around the world.