I learned this today. Spot welding was discovered by accident by Elihu Thomson in 1877 when he was giving a lecture on electricity and accidentally passed a current through two pieces of wire. Spot welding is obviously a form of welding. Welding is the process of joining any two pieces of metal together through heat. […]
#57 How does spot welding work and what is it used for? Read More »
I learned this today. Gold is so rare because it takes a staggeringly large amount of energy to produce it naturally. Gold has been treasured for as long as humans have been able to find it because of its unique properties. It is resistant to corrosion, conducts electricity and heat very well, doesn’t tarnish, is
#56 Why is gold so rare? Read More »
I learned this today. White blood cells kill invading bacteria, germs, and viruses in your body by eating them. White blood cells are produced by bone marrow. They are produced by hematopoietic stem cells, and they are stored within the bone marrow or lymph tissue until they are needed. They are also called leukocytes. When
#50 How do white blood cells kill pathogens? Read More »
I learned this today. An MRI works by causing the protons in the hydrogen nuclei in our bodies to align with a magnetic field and then disrupts them with a radio wave. Our bodies contain about 60% water, but this figure changes depending on the organ. All of the organs in our body, our tissue,
#43 How does an MRI work? Read More »
I learned this today. Cigarettes are addictive because the nicotine they contain is a highly addictive chemical. Nicotine is a naturally occurring chemical that is produced by plants. It is produced by many different types of plants: nightshade, tobacco, the coca plant, tomato, potato, eggplant, and green pepper. The concentrations differ depending on the plant.
#41 Why do we become addicted to nicotine? Read More »
I learned this today. You need to have four satellites in view to be able to use GPS. (Global Positioning System). Currently, there are 32 satellites orbiting in the Global Positioning System. One thing I learned today is that GPS is actually an American government-owned system. It was started by the American Department of Defense
#40 How does GPS know where I am? Read More »
I learned this today. Unlike when skin heals, bones usually heal without a scar. When you cut yourself, your body’s primary goal is to replace the skin as quickly as possible to keep infection out and your blood in. When it does this, it leaves a scar because it builds the new skin so quickly.
#39 How do broken bones heal? Read More »
I learned this today. The most common kidney stones are caused when there are more minerals in the blood than the kidneys can reabsorb. Most people have two kidneys. The kidneys have three jobs that they do for us. Their first job is to filter waste products out of the blood. Together, they filter 200
#36 How do kidney stones form? Read More »
I learned this today. Fireworks that are shot into the sky are made up of a stabilizer, a fuse, a charge, and an effect section. Fireworks that are launched into the sky were invented in China in about 1200 AD, but explosive fireworks were invented much earlier than that. Gunpowder was invented in about 142
#35 How do fireworks work? Read More »
I learned this today. Ships float because the density of the total volume of the ship is less than the density of the same volume of water it displaces. An object will float on a liquid if it is less dense than the liquid it is floating on. The density of water is 997 kg/m3.
#34 Why do ships float? Read More »
