#266 Who invented ice cream?
I learned this today. Modern ice cream was invented in 1695. Nobody knows when ice cream itself was invented. Ice desserts aren’t […]
#265 What is a superfluid?
I learned this today. A superfluid is a point where matter behaves like a fluid but has zero viscosity.A superfluid has no […]
#264 Why are the aurora borealis those colors?
I learned this today. The aurora borealis are green, purple, pink, and blue because those are the colors given off when the […]
#263 Why do trees have rings?
I learned this today. Trees have rings because they do not grow through the winter when it is too cold. The study […]
#262 What is hardtack?
I learned this today. Hardtack is a dense biscuit made from flour, water, and sometimes salt. It was sometimes called “ship’s biscuit” […]
#261 When did people first start using paper money?
I learned this today. The first paper money was issued in China in the 7th century. Many countries around the world had […]
#260 How do some animals sleep standing up?
I learned this today. Animals can sleep standing up by locking a set of muscles and tendons in their legs, using gravity […]
#259 How does a hand grenade work?
I learned this today. A hand grenade works because the removal of the lever starts a series of steps that ends with […]
#258 How can a laser power a solar sail?
I learned this today. The energy from the photons in a laser beam can be used to propel a very light sail […]
#257 Who was the first war correspondent?
I learned this today. The first war correspondent is technically William Howard Russell. William Howard Russell was a war correspondent during the […]