I learned this today. There is evidence of a dentist from 12,000 BC. Before humans took up agriculture, possibly about 12,000 years ago, we were hunter-gatherers and we had less tooth decay than when we became farmers. Researchers were able to extract dental plaque from the teeth of 34 prehistoric European skeletons. Dental plaque is […]
#96 When was the first dentist? Read More »
I learned this today. In the 1930s, the introduction of the refrigerator into homes put the ice harvesting industry out of business. Any kind of food, be it meat, fish or vegetable, is going to start going bad. Food decays because micro-organisms like bacteria feed on the food. Bacteria use enzymes to break down the
#95 What happened to the ice industry? Read More »
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 gun cartridge consists of four parts. It has an outer casing, usually made of brass because it is very good at handling the pressure of
#94 What is the caliber of a gun cartridge? Read More »
I learned this today. Absolute zero is zero Kelvin, which is -273.15℃, but it is impossible to reach. Absolute zero is considered to be the lowest temperature possible. At this point, there is no energy left in a solid. In any object, the molecules are moving. In my fingers. In the keyboard I am typing
#93 Is it possible to get absolute zero? Read More »
I learned this today. Bees make honey as a way to store food through the winter. Flowers cannot move, so they need insects to help them reproduce. To pollinate another flower, the pollen from one flower has to reach another flower. The best way for flowers to do this is to have the pollen stick
#92 Why do bees make honey? Read More »
I learned this today. The Rosetta stone helped translate hieroglyphics because it had the same message written in hieroglyphics, the cursive Egyptian script for regular people called demotic, and ancient Greek. The Rosetta stone is a large slab of granodiorite that probably stood in a temple. It has a decree written on it that concerns
#91 How did the Rosetta stone help people decipher hieroglyphics? Read More »
I learned this today. Sugar came to England in 1069 but it wasn’t eaten by most people until 700 years later. The average British person eats about 90kg of sugar a year. This is not only unhealthy, it is also a relatively recent trend. In 1750, it was about 1kg a year. By 1820, that
#90 When did people in Europe start eating sugar? Read More »
I learned this today. The Large Hadron Collider accelerates particles to close to the speed of light by using electric fields and radio waves. The Large Hadron Collider (LHC) was built between 1998 and 2008 for CERN, the European Organization for Nuclear Research. I know you are thinking that should be EONR, but CERN comes
#89 How does the Large Hadron Collider work? Read More »
I learned this today. Venice was built on 118 small islands in a marshy lagoon because the people from local Roman cities were fleeing waves of Germanic and Hun invasions. The city of Venice was founded at noon on Friday 25th March, 421 AD with the dedication of the first church. Construction started possibly five
#88 Why is Venice where it is? Read More »
I learned this today. Stars die because they exhaust all of their fuel. There are seven different types of star. They are classified using the Morgan-Keenan system. They are given the letters, B, A, F, G, K, and M, to show temperature, and Roman numerals to show luminosity. M, the coolest stars, are between 2,400
#87 How do stars die? Read More »
