Source: Wikipedia
The arrival of an animal in a household is one of the few truly memorable events of an ordinary childhood, largely because of how long it took to bring…
Navigation problems divide into two parts, and confusing them is the reason this subject seems simpler than it is.
The first is knowing which way you are facing. A compass…
The interesting thing about an egg is how many contradictory requirements it satisfies simultaneously. Strong and breakable, sealed and breathing, hidden and identifiable. Here are sixteen.
1. It Has to…
The governing constraint is that heat is gained by volume and lost through surface, so the ratio between the two determines the entire problem. Almost everything below follows from that.…
Almost nothing in the animal world does what this does.
A great many animals signal. They warn, threaten, court and call, and the signal refers to the here and now…
The test is simple: pigment colour looks the same from every angle, and structural colour changes as you move. Once you know that, a great deal of the natural world…