I learned this today. There is no reason why the speed of light is 299,792,458 m/s. It just is. The speed of light is the top speed that matter or energy can travel at. All forms of electromagnetic radiation travel at the speed of light. Radio waves and electricity, for example. Nothing can travel faster […]
#129 Why is the speed of light 299,792,458 m/s? Read More »
I learned this today. Cancer kills people because it grows into key organs, nerves or blood vessels and impairs their function. Cancer is caused when cells start to change abnormally. New cells in our bodies form through growth and division. When cells become old and need to be replaced, they are switched off and die.
#127 How does cancer kill people? Read More »
I learned this today. The body produces a fever because pyrogens cause the hypothalamus to raise its set-point for body temperature. Fever is a defense mechanism, and most fevers happen when your body has a bacterial, viral or parasitic infection. Other things, such as alcohol withdrawal and heat stroke, can also cause a fever. Raising
#124 What makes the body produce a fever? Read More »
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 »
I learned this today. Nuclear pasta is a theoretical matter that might exist in the crust of a neutron star. It would be the strongest material in the universe and would be ten billion times stronger than steel. A neutron star forms when a supergiant star collapses. Stars are made up of hydrogen and helium.
#115 What is nuclear pasta? Read More »
I learned this today. Smallpox was responsible for as many as 500 million deaths in the 20th century, but it was completely eradicated by December 1979. Smallpox is a disease caused by four orthopoxviruses. They are variola, vaccinia, cowpox, and monkeypox. Variola only infects humans while the other viruses can infect other animals as well.
#114 What happened to smallpox? Read More »
I learned this today. Thomas Edison used thin strips of bamboo in his early light bulbs because carbonized bamboo has a very high electrical resistance. When Edison started trying to improve the light bulb, there were two basic forms of light available: arc lights and incandescent lights. An arc light is one that makes light
#113 Why did Thomas Edison use bamboo in his light bulb? Read More »
I learned this today. Evergreen trees keep their leaves for longer because they have evolved to survive in colder areas with less yearly sunlight. An evergreen tree is a tree that doesn’t lose its leaves all at once in the way a deciduous tree does. The leaves do fall off, but when they are old,
#111 Why don’t evergreen trees lose their leaves in the winter? Read More »
I learned this today. Graphene is a one-atom-thick layer of carbon atoms arranged in a hexagonal lattice. It is incredibly thin and incredibly strong. In 1859, Benjamin Brodie noticed that graphite oxide contained lots of layers. In 1947, P. R. Wallace published a paper on the band structure of graphite and theorized that a single
#109 What is graphene and why is it so important? Read More »
I learned this today. The International Prototype of the Kilogram, kept in Paris, is not accurate enough to be the standard for all kilograms around the world. Different measures for different things have been used around the world since people began measuring things. These measurements were usually related to the human body or common things
#108 Why is the official kilogram in France no longer used? Read More »
