How do scales work? There are four different types of scales and they work in different ways. They are balances, steelyard balances, spring scales, and digital scales. Balance scales are the easiest to explain and they were the first scales used to measure the weights of objects. The first balance scales were used in the […]
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Who invented the skateboard? The skateboard was invented so that surfers could keep surfing when the sea was flat and there were no waves. So, who invented surfing? Surfing has been around for thousands of years. Fishermen in ancient Peru fished in kayaks made of reeds and they surfed them back to shore when they
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Do ants need to sleep? Ants do actually sleep, but not all at once. There are very few living organisms that don’t need to sleep. However, they all do it in different ways and there are many different definitions of what sleep is. Bacteria don’t sleep. Although they are tied to a circadian rhythm and
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How does the heating element in a toaster work? It is made of a metal that has a high electrical resistance so it heats up very quickly. The heating element in a toaster is made of nichrome. Nichrome is an alloy made from (usually) 80% nickel and 20% chromium. Hence its name: nickel+ chrom(e)ium. There are four
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When was corrugated cardboard first used? Corrugated cardboard was first used as a liner for top hats. Corrugated cardboard is commonly used for making cardboard boxes and if you have ever ordered anything from Amazon, you will have handled some. It consists of a corrugated sheet sandwiched between two linerboards. The corrugated layer gives it
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What is the tallest a mountain can be? It depends on the strength of the surface gravity, the amount of volcanic activity, the movement of tectonic plates, and the weather. The highest mountain on Earth is Mount Everest at 8,848 meters high. Technically Mauna Kea in Hawaii is the tallest mountain if you measure from
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By Pablo Picasso – wordpress, PD-US, https://en.wikipedia.org/w/index.php?curid=38782663 What is cubism? Cubism is an art form where the artist tries to show an object from multiple viewpoints at the same time. Pablo Picasso is credited with inventing cubism in about 1907, but he wasn’t the only artist experimenting with shapes, he was only the most well-known
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Why do we get a headache when we are dehydrated? You get a headache when you are dehydrated because your brain shrinks and pulls away from the sides of your skull. The human body is about 60% to 70% water. Some parts of the body contain more water than other parts. The blood and the
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When did people first start using locks and keys? Keys and locks were first used about 6,000 years ago. The earliest lock that has been found so far was 6,000 years old and was found in the ruins of Nineveh, the capital of ancient Assyria. The fact that a fully formed lock was discovered means
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Can you cure male-pattern baldness? In male-pattern baldness, the hair follicles are still present on the scalp, they are simply dormant. What is male-pattern baldness? It is hair loss that most commonly happens to males and usually follows a specific pattern. It begins at the temples and at the top of the head. The hair
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