How are tower cranes assembled? By raising themselves up and adding in a piece at a time. There are many different types of cranes, but they are divided into two categories: mobile and fixed. We are looking at the cranes that are used to build skyscrapers today, and they are fixed tower cranes. Any type […]
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How does a skeleton key work? By removing all of the parts that would get caught on the wards. Skeleton keys are also known as pass keys or master keys. They are called “skeleton keys” because all of the main parts of the key have been stripped off and only the skeleton is left. People
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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 13 crowns, 6 swords, 6 sceptres, 16 trumpets, 13 maces, 3 robes, 3 rings, 3 coronets, 2 orbs, 1 spoon and bottle, and lots of
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Why do we say boycott? The word comes from a British land agent who lived in Ireland. His name was Captain Charles Cunningham Boycott. He was born in England in 1832. He joined the army when his family paid for his commission in 1850. He was not able to join on the strength of his
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What is the opposite of white? Either black or transparent. Let’s look at what colors are, what white is, and what black and transparent are. Colors appear when an object reflects a certain wavelength of light. Light is energy that is flying through space, called electromagnetic radiation. There are many different types of light and
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How does crop rotation work? By alternating crops to give the soil a rest and to replace nutrients that are removed. People transitioned from a hunter-gatherer culture to an agricultural culture in about 12000 BC. First, they domesticated animals. This happened in different places on Earth within a few thousand years. In about 9500 BC,
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How tall could a skyscraper be? Theoretically 69.1 km tall, but practically, about 2 km. The tallest building in the world at the moment is the Burj Khalifa. It is 830 meters tall. For over 3800 years, the tallest building in the world was the Great Pyramid at Giza. It was 147 meters tall when
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How does a photocopier work? They work because light carries energy and opposite electric charges attract. The first principle that the photocopier relies on is that light carries energy. Light is a little difficult to understand. According to Einstein, anything that travels at the speed of light cannot have any mass. If something has mass
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When did people start using punctuation? The Greeks were the first people to use punctuation, but the Bible made it commonplace. Most early languages used a writing system that was based on images. There was no need for punctuation or even spaces because the ideas were contained in the symbols. Modern languages like Japanese and
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How do you build a tunnel underwater? You can either build the tunnel above ground in pieces and lower it into the water, or you can dig the tunnel underground. Humans have been making tunnels for thousands of years. The art of tunneling probably started when prehistoric people wanted to make their caves bigger.
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