#352 How do reflexes work?
How do reflexes work? They work by using a reflex arc that bypasses the brain. There are many different types of reflex, but they are generally meant to protect us…
How do reflexes work? They work by using a reflex arc that bypasses the brain. There are many different types of reflex, but they are generally meant to protect us…
What is the Doppler effect? The Doppler effect is the change in frequency of a wave in relation to an observer who is moving relative to the wave source. All…
How do amphibians breathe underwater? They breathe through their skin. The word “amphibian” comes from the Greek amphi, meaning both and bios, meaning life. The word was first used in…
#426 When were credit cards invented? When were credit cards invented? The first use of the phrase “credit card” was in 1887. A credit card is a system whereby a…
What are the crown jewels? The crown jewels are a collection of 142 objects, many are used in ceremonies such as the coronation. The Crown Jewels are made up of…
How did the Polynesians navigate? They used star compasses, maps of waves made using sticks, clouds, the color of the sky, and birds. From about 5,000 years ago, groups of…
What was the Carrington Event? It was the largest ever geomagnetic storm in recorded history? The Carrington Event lasted from the 1st to the 2nd of September 1859. It was…
What causes brain damage? There are several things that cause brain damage. These can be traumatic injury, poison, stroke, tumor, or lack of oxygen. The brain weighs about 1.5 kg…
How did the Black Death change society? It ended serfdom and slavery, improved worker conditions, brought a recession, harmed religion, increased antisemitism, improved medical practice, improved women’s rights, and changed…
How did the Black Death spread? It was spread by people along trade routes. The Black Death is another name for bubonic plague, which is caused by a bacteria called…