I learned this today. Scaffolding is attached to the building by placing ties through windows, by drilling holes in the brick, or by anchoring them to the ground. Scaffolding has been used for thousands of years. Sockets have been found in the walls around the cave paintings in the Lascaux cave network. These paintings are […]
#274 How is scaffolding attached to a building? Read More »
I learned this today. A hand grenade works because the removal of the lever starts a series of steps that ends with an explosion. There are many different types of grenade. I am going to look at the fragmentation grenade. Most of us imagine the Mk 2 grenade when we think of a hand grenade.
#259 How does a hand grenade work? Read More »
I learned this today. The Richter scale is a way of measuring the strength of an earthquake by looking at the height of its seismic wave. The Richter scale was developed in 1935 by Charles Francis Richter. He was an American physicist who was very interested in seismology. He came up with his system because
#256 What is the Richter scale? Read More »
I learned this today. The British and American accents are different because the UK accents dropped a few things that the US kept. It is obviously difficult to generalize about UK and US accents because there are wildly different accents within each country. So, why do accents form? Accents form because of the history and
#245 Why are American and British accents different? Read More »
I learned this today. A spray bottle works by breaking the liquid up into tiny droplets using a pump and different kinds of nozzles. Modern spray bottles work slightly differently to older spray bottles. The first kind of spray bottles used a rubber bulb and an atomizer nozzle. They were invented by an American called
#242 How does a spray bottle work? Read More »
I learned this today. The Sahara Desert has grown so big because the precession of the Earth’s axis as it rotates around the sun changes the location of the African monsoon. The Sahara Desert is 9.2 million square kilometers, which makes it bigger than every country except for Russia, Canada, China and the USA. The
#229 How did the Sahara Desert get so big? Read More »
I learned this today. Different countries have different laws, but the first bankruptcy laws were created in 1542 in England. The word “bankruptcy” comes from the Italian banca rotta, which means “broken bench”. The story is that bankers used to do their business over a bench. If a banker defaulted on a loan
#226 When did bankruptcy laws start? Read More »
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. 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 »
