How long do viruses and bacteria live for? It depends on the virus and the bacteria. Also, bacteria are alive, but viruses are not alive. In order for something to be considered alive, it has to meet certain characteristics. It has to have specialized parts that are coordinated. It has to metabolize something to make […]
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How do night vision goggles work? There are two types: the old style and the new style. The old-style goggles work by detecting and enhancing infrared light. The newer ones work by digitally enhancing the image. We cannot see well in the dark. Our eyes work by collecting reflected light radiation and transmitting it to
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What is a sprain? It is when the ligaments around a joint are injured. There are 350 joints in the human body, depending on what you define as a joint. We have joints that actually don’t move. These are called synarthrosis joints and their job is to give structural support. The joints between the pieces
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What is a speakeasy? It was a bar where alcoholic drinks were illegally sold during the era of prohibition. From 1920 to 1933, alcohol was illegal in the United States of America. This was brought into law by the 18th Amendment to the Constitution. The amendment says, “After one year from the ratification of this
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Why does Australia have so many dangerous animals? It actually doesn’t have as many dangerous animals as people think and there are other countries that have more. However, for a single country it does have a large number of dangerous animals, partly because of its location, its size, and because of evolution. Let’s try and
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What are stalagmites and stalactites? They are deposits of minerals that form in caves. Stalactites hang down from the top of the cave and stalagmites rise up from the ground. To help you remember, stalactites have a “c” for ceiling and stalagmites have a “g” for ground. If you want another way to remember which
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When did sailing ships die out? There are still ships that use sails today and a new type of large cargo ship that uses wings has been introduced, but the age of sail finished on October 20th, 1827. The first ships were probably powered with oars. However, a boat with oars cannot go very far
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What is CRISPR? It is a way of editing genes and it stands for Clustered Regularly Interspaced Short Palindromic Repeats. It works by separating the genes inside the DNA and inserting a mutation. To begin with, let’s look at what DNA and genes are. DNA is inside all of our cells and it holds the
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Why does time go forward not backward? Because of entropy. Entropy is the measure of how random and dispersed the energy and mass in a system are distributed. It is described by the Second Law of Thermodynamics, which says that the entropy of a closed system increases over time. The system has to be closed
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Who was the first king? This could be a question that is impossible to answer because most of the records of early rulers have disappeared or there is no way to separate myth from truth. It also depends on what the definition of king is. At what point does somebody go from being a tribal
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