#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 to lock a joint, or using a flexor…
I learned this today. Animals can sleep standing up by locking a set of muscles and tendons in their legs, using gravity to lock a joint, or using a flexor…
I learned this today. A hand grenade works because the removal of the lever starts a series of steps that ends with an explosion. There are many different types of…
I learned this today. The energy from the photons in a laser beam can be used to propel a very light sail into space. A laser powered solar sail could…
I learned this today. The first war correspondent is technically William Howard Russell. William Howard Russell was a war correspondent during the Crimean War. The Crimean War was a war…
I learned this today. The Richter scale is a way of measuring the strength of an earthquake by looking at the height of its seismic wave. The Richter scale was…
I learned this today. The surface tension of water is higher than almost all other liquids because it contains so much hydrogen. Surface tension is what allows droplets to form…
I learned this today. Julius Caesar is supposed to have burned the library of Alexandria down in 48 BC, but it appears that it wasn’t destroyed and probably survived for…
I learned this today. Sustained G-force of 6 G are generally considered to be fatal because they squash our organs and starve our brains of oxygen. Gs is the shortened…
I learned this today. Some planets have rings because they have captured debris, but that debris is too close to the planet to form into a moon. In our solar…
I learned this today. Insulin is a peptide hormone that regulates the metabolism of carbohydrates, fats, and proteins in the body. How is insulin made? Insulin is made in the…