Situation puzzleA silk scarf

Bill is a World War I pilot. He needs a scarf so as not to rub his neck while searching for enemy planes.

Explanation:

The first military aircraft (“air stacks”) had an open cockpit. At the same time, the flight speed reached 150 km/h. So, the pilots wore thick leather clothes with maximum wind resistance.

At that time, there were no long-range detection systems. To be the first to detect the enemy, the pilot had to turn his head round at least every 20 seconds. The cases are known when pilots rubbed their necks to blood.

That’s how the pilots got white silk scarves for flights. Silk is a very smooth and at the same time dense fabric. It served both as protection from the headwind and as a smooth layer between the skin and the collar.