When was the Roman forum built? In the 7th century BC. The beginning of the Roman forum is difficult to get a grip on because the Romans liked to embellish the legend of the formation of Rome. The legend is that Rome was founded by the brothers Romulus and Remus in 753 BC. The brothers […]
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Why is PM 2.5 dangerous? They are particles that are too small for our nose to catch. PM stands for Particle Matter and they are microscopic solid or liquid particles that are small enough and light enough to be suspended in the air. There are many sources of these particles. In some countries, one of
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Why are diamonds so expensive? Because we believe they should be expensive, not because they are rare. We think that diamonds are expensive because they are rare, but they are not as rare as we think. Diamond is a structure made of carbon atoms that are arranged in a crystal structure. Diamond is one of
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Why did the Mayan civilization collapse? Probably because of overpopulation, environmental damage, war, and extended drought. The Mayan people lived in an area that is where southeastern Mexico and northern Central America are today. People started living there in about 8000 BC. By 2000 BC the Maya were settled and farming the land. From about
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When was the penny first used? The first coin to be called a penny was in 790, but the word meant “all money” and not just one coin. There are several currencies across the world that use “penny” for their smallest coin. In the UK there is a one penny coin. In the United States
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How do fossils form? They form when the bones of an animal are turned to mineral. A fossil forms when an animal dies in water or falls into water. This water is more commonly an ocean or a lake because for a fossil to form, the sediment at the bottom of the water has to
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Do cyanide pills kill as quickly as in the movies? Perhaps. If it is the right kind of cyanide, it can kill in about 2 to 5 minutes. There are several different types of cyanides and they can be found in liquid, solid, or gas form. Cyanide is a group of chemicals that have a
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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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Can we cover the Sahara Desert in solar panels? Technically, yes. Practically, no. The Sahara Desert is the largest hot desert in the world. It covers 9.2 million km2, which would make it the fifth largest country in the world, if it were a country. It is one of the most exposed areas on Earth
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Why does popcorn pop? Pressure builds up as the water in the kernel heats up until it explodes. People have been eating popcorn for thousands of years. Archaeological evidence of popcorn from Peru in 4700 BC has been found. Corn, which is more commonly known as maize, was domesticated about 10,000 years ago but modern
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