I learned this today. The Kola borehole is the deepest manmade borehole on Earth, and it is the deepest artificial point on Earth. The Kola borehole is on the Kola Peninsula, which is on the Russian border with Norway. It is in the very far north of Russia and is in the Arctic […]
#225 What is the Kola borehole? Read More »
I learned this today. Many animals can run quickly because they have four legs, run on their toes, and have bodies designed for speed. There are three types of animals when it comes to the shape of feet. There are plantigrades, digitigrades, and unguligrades. We are plantigrades. Along with rodents, rabbits, hedgehogs, kangaroos,
#224 Why can animals run so fast? Read More »
I learned this today. The Magna Carta promised the protection of church rights and the protection of the barons from King John and eventually became the basis for English common law. By extent, its concepts are also the basis for some American and Canadian laws as well. It was the first time the idea that
#223 What did the Magna Carta do? Read More »
I learned this today. Hydraulic machines work because a force applied at one point to an incompressible fluid is transmitted to another point and multiplied at the same time. There are two principles at work in a hydraulic system. The first is that an incompressible liquid will transfer energy and the second is that
#222 How does a hydraulic system work? Read More »
I learned this today. Radar works by using radio waves to work out the position of objects relative to the detector and sonar uses sound waves. Radar works in a similar way to sonar, but it is far more effective in air. A sonar system sends out a sound and waits for the sound
#221 What is the difference between sonar and radar? Read More »
I learned this today. Hawai’i became a state in 1959, when 93% of Hawaiians voted in favor of it. People have only lived on the islands of Hawai’i since about 400 AD. Polynesians sailed there from the Marquesas Islands, which are about 3200 km away. They settled the islands and fished and farmed
#220 Why did Hawai’i become a US state? Read More »
I learned this today. Deep sea fish can survive because they don’t breathe in the same way that we do. However, even they cannot survive at the very bottom of the ocean. Pressure at sea level is 14.7 psi (pounds per square inch). If someone weighing 14.7 pounds stood on you, you would
#219 Why don’t deep sea fish get crushed by the pressure? Read More »
I learned this today. The Trieste, a Swiss and Italian submarine reached a depth of 10,911m. This is the deepest point on Earth and is the Challenger Deep of the Mariana Trench. Different submarines can reach different depths, depending on what they are needed for. A submarine that is built to go deep
#218 How deep can a submarine go? Read More »
I learned this today. Bulletproof glass is made of two different types of laminated glass, one hard and one soft. Glass was invented in about 2500 BC, although only used as beads and jewelry. In 1450 BC, Egyptians started using glass drinking vessels. Plate glass was invented in about 1620 and glass production was
#217 How does bulletproof glass work? Read More »
I learned this today. Antimatter is matter made up of antiparticles. An antiparticle and a particle have the same mass but opposite electrical charges. A proton, for example, contains three quarks (2 up and 1 down), has a positive charge, and weighs 0.00000000000167262192 picograms. (A picogram is 100 billionth of a gram.) An
#216 What is antimatter? Read More »
