When did people start sending postcards? The first postcard that we would recognize today as a postcard was sent in 1861, and by the end of the 1860s, they were being commercially made and posted. We have probably all sent and received a postcard in our lifetime. You go to a nice destination, you buy […]
#1462 When did people start sending postcards? Read More »
Where could life in the solar system be? Life in the solar system, if there is any, could be on the moons Europa, Titan, Enceladus, and the surface of Mars. We don’t know what life on other planets would need to survive. All we can say is what life on our planet needs to survive,
#1461 Where could life in the solar system be? Read More »
Where did the word “OK” come from? There are different theories about where “OK” came from, but it appears to have started in Boston in the 1830s, thanks to a fashion there for incorrectly abbreviating words for humorous intent. OK is probably the only word in any language that is truly universal. There are probably
#1460 Where did the word “OK” come from? Read More »
What is anaphylactic shock? Anaphylactic shock is when the body has an allergic reaction and there is a sudden drop in blood pressure, and the airway constricts. Unless treated, it can be fatal. Anaphylactic shock is at the very far end of an allergic reaction. The body goes out of control, and the results can
#1459 What is anaphylactic shock? Read More »
Why do locusts swarm? Locusts swarm because they come into contact with other locusts. This seems like a chicken and an egg problem. Locusts swarm because they come into contact with other locusts, and they come into contact with other locusts because they swarm. A locust swarm can be a terrible sight to behold. There
#1458 Why do locusts swarm? Read More »
What is the Antikythera mechanism? It is a machine that was found in an ancient shipwreck near the island of Antikythera, a Greek island on the edge of the Aegean Sea. It is thought to be a machine to predict eclipses, model the lunar phases, and track astronomical cycles. It is also said to be
#1457 What is the Antikythera mechanism? Read More »
How is wombat poo cube shaped? They have a very elastic intestinal tract, which shapes their poo into 2 cm cubes. Wombats are four-legged marsupials that are native to Australia. They are low to the ground and weigh about 35 kg, giving them a low center of gravity. A lot of different types of wombats
#1456 How is wombat poo cube shaped? Read More »
Why is the sun’s corona so hot? The corona of the sun is so much hotter than the surface of the sun because it is probably heated by waves that carry extra energy out from the sun. This is currently the most likely theory. The corona of the sun is the outer edge of the
#1455 Why is the sun’s corona so hot? Read More »
How did a Roman aqueduct work? An aqueduct works by moving water from an area of higher elevation to an area of lower elevation using the force of gravity. The word aqueduct comes from Latin, and we still use several Roman aqueducts, but the Romans didn’t invent the aqueduct. The word is made from “aqua”,
#1454 How did a Roman aqueduct work? Read More »
Why do crabs use sea anemones as weapons? The crab, known as the pom-pom crab, uses sea anemones to defend against predators and to sting its prey. There are three types of symbiotic relationships in the world. The first is mutualism. In a mutualistic relationship, both parties receive a benefit that they would not be
#1453 Why do crabs use sea anemones as weapons? Read More »
