#151 How do run-flat tires work?
I learned this today. There are three different types of run-flat tires. Ones that can self-seal a hole, ones that can still support the weight of the car when flat,…
I learned this today. There are three different types of run-flat tires. Ones that can self-seal a hole, ones that can still support the weight of the car when flat,…
I learned this today. Erasers work because of friction. They become sticky when they are hot and hold onto the graphite particles. Before we look at how erasers work, I…
I learned this today. A machine gun works by using the recoil or the gas of the cartridge explosion to reload and re-cock the gun after each shot. There are…
I learned this today. We have 24 hours in a day because of Hipparchus. We have 60 seconds in a minute and 60 minutes in an hour because of Claudius…
I learned this today. Pykrete is a frozen material made of 14% sawdust and 86% water. It is as strong as concrete. Pykrete was put forward during World War II…
I learned this today. Shoe sizes in America and the UK are measured in barleycorns. Nobody knows when people first started wearing shoes, but experts think it might have been…
I learned this today. Fight or flight, the stress response, was first described by Walter Bradford Cannon in 1915. In 1915, Cannon published Bodily changes in pain, hunger, fear and…
I learned this today. The caliber of a cartridge relates to the size of the gun’s barrel in hundreds of an inch in America or in mm in Europe. A…
I learned this today. The Panama Canal has reduced the journey from the Atlantic Ocean to the Pacific Ocean by 8,000 nautical miles (14,818 km), about 22 days. Before the…
I learned this today. The tallest a human could potentially grow is about 9 feet, 274cm. Humans grow because of a growth hormone called somatropin. It stimulates growth by telling…