I learned this today. Vellum is a material for writing on that is made from prepared animal skin. The document on the front of this article is the Magna Carta. It is the document that tried to control King John of England and is one of the most famous documents in the UK. It was […]
#186 What is vellum? Read More »
I learned this today. Antarctica is a polar desert because it has less than 250mm a year of precipitation, which is the set amount to be classified as a desert. However, it is classified as an ice cap climate because it isn’t hot enough to be called a desert. Deserts can be classified using the
#167 Is Antarctica a desert? Read More »
I learned this today. The first fire extinguisher was patented in 1723 by Ambrose Godfrey. For thousands of years, the only way to fight fire was to bring water to it. If you lived too far from a water source, then your house was going to burn down. Friends, family, or anyone available would rush
#157 When did we start using fire extinguishers? Read More »
I learned this today. Superglue works because a chemical reaction occurs that makes it harden. Superglue is made from ethyl cyanoacrylate, which is an acrylic resin. Cyanoacrylate hardens when it comes into contact with water. Cyanoacrylate is an acrylic monomer. A monomer is a molecule that can react together with other monomer molecules to form
#156 How does superglue work? Read More »
I learned this today. Reuters is an international news agency that started in Germany 150 years ago. Reuters was started by Paul Julius Reuter in 1851 and he could have had no idea what he was starting. Paul Reuter was born in Germany as Israel Beer Josaphat. He moved to London in 1845 and changed
#155 What is Reuters? Read More »
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, and ones that have an insert on the wheel rim that can support the weight of the car. Self-sealing tires have a layer of sealant
#151 How do run-flat tires work? Read More »
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 think we need to look at how pencils are able to write on paper. Pencils are made with graphite. These days the graphite is mixed
#140 How does an eraser work? Read More »
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 basically three different types of machine gun: recoil actuated, gas-operated reloading, and externally actuated. Recoil and gas-operated reloading guns follow the same theory, which is
#131 How does a machine gun work? Read More »
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 Ptolemy, Al-Biruni, and the Babylonians. Before we look at this topic, we have to remember that needing to know the time exactly is a fairly
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 by Geoffrey Pike, who was the head of Project Habakkuk, an idea to use pykrete to build a floating aircraft carrier. The material was like
#118 What exactly is pykrete? Read More »
