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 does a steam engine work? By taking the energy contained in coal and making heat. Then using the heat to turn water into steam and using the steam to push and pull a piston. The steam engine was the invention that helped push the Industrial Revolution. However, the knowledge of steam power has been
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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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When did the Egyptian Empire start to decline? It peaked during the reigns of Ramesses II and Ramesses III from 1279 BC to 1155 BC) and then began to decline. People have been living along the Nile valley since about twelve thousand years ago. They were hunter gatherers and fishermen to start with, but they
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Where did the names of the continents come from? Generally, from Greek and Latin. There are seven continents and one continent that is almost completely underwater. In order of size, the continents are Asia, Africa, North America, South America, Antarctica, Europe, and Australia. The submerged eighth continent is Zealandia. The only part of Zealandia that
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It is olive oil that is made cold-pressed, without heat or chemicals. Olive oil has been used for thousands of years. Olives grow naturally around the Mediterranean and they were picked and eaten by Neolithic people about 6,000 years ago. Olives appeared in Asia Minor, which is where Turkey is today. The olive tree was
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How does an electroencephalogram work? By measuring electrical activity in different parts of the brain using electrodes on the scalp. EEGs are used to diagnose disorders with the electrical activity in the brain. These can be epilepsy, sleep disorders, anesthesia, coma, and even brain death. It is most commonly used for diagnosing epilepsy, which is
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Why were the Wright brothers able to fly in 1903? Because they employed a very methodical and scientific method and because of technological advances. On December 17th, 1903, at 10:35, Orville Wright flew the Wright Flyer for 12 seconds and covered 37 meters. It was the first ever powered flight. They flew three more times
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Is nuclear waste dangerous? It is if it isn’t handled properly. This was interesting to research. All of the sites I looked at that were run by nuclear organizations said, “no, no, of course not,” while the sites I looked at from other sources said, “possibly.” When we think about nuclear waste, we think about
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Why did the Olympic Games restart in 1896? Frenchman Pierre de Coubertin fought to restart the Olympics because he thought they would encourage sport among amateurs, and promote peace. The Olympic Games that was held in 1896 is often referred to as the 1st modern Olympic Games because the tradition of the games goes back
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