#149 Why do cats sleep for so long?
I learned this today. Cats sleep as much as they do to conserve energy. Something we should probably learn from. Not that […]
#148 What is a tokamak?
I learned this today. A tokamak is a device that uses a strong magnetic field to keep a gas plasma in a […]
#147 Why did the Bronze Age start?
I learned this today. The Bronze Age started because people discovered that combining copper and tin made a stronger alloy called bronze. […]
#146 How do gas masks work?
I learned this today. Gas masks work by blocking bacteria and viruses, or by absorbing or altering chemicals. Gas masks have to […]
#145 Why did the Portuguese royal family end up in Brazil?
I learned this today. The Portuguese royal court moved to Brazil in 1807 to avoid being deposed by Napoleon. Spain and Portugal […]
#144 How do people know the age of the universe?
I learned this today. There are two ways to work out the age of the universe. The first is to calculate the […]
#143 When did people start putting drinks in cans?
I learned this today. The first drink put in a can was beer in the 1930s, but it took a while before […]
#142 Why do Venus and Uranus spin the wrong way?
I learned this today. Venus and Uranus spin in the opposite directions to the other planets possibly because Venus flipped over and […]
#141 Where did the stones of Stonehenge come from?
I learned this today. The different rocks of Stonehenge came from three different places. Stonehenge was probably built between 3000 and 2000 […]
#140 How does an eraser work?
I learned this today. Erasers work because of friction. They become sticky when they are hot and hold onto the graphite particles. […]