How do we know that the Earth is round?
There are some things that everybody knows without thinking about. The sky is blue, apples are red, water is wet, the Earth is round. But it’s important to regularly question ourselves and check for errors. It doesn’t take much thought to realise that the sky is usually NOT blue – on overcast days it is grey, at night it’s black, at sunset it can be practically any colour you care to name. Apples come in green varieties. When water freezes into ice, or … Continue reading →