Why do salmon swim upstream? They return to the place they were born to lay their eggs. Salmon are born in freshwater streams. The adult salmon lay eggs in the sand and gravel at the bottom of the river, which hatch and become baby salmon, which are called alevins. The alevins still have a yolk […]
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What did the peppered moth do? It changed from a light color to a dark color during the Industrial Revolution. The peppered moth is native to most places in the northern hemisphere. They are about 5.5 cm with their wings spread out. They fly at night and they are generally a mix of light colors
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How many different eye colors do people have? There are only 6 different eye colors. They are amber, blue, brown, gray, green, and hazel. There are many different colored eyes in the animal kingdom, but humans are far more limited in eye color than we think. Out of the six colors, brown is the most
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What is DDT? It stands for dichloro-diphenyl-trichloroethane and was the first synthetic pesticide. It was banned in 1972. DDT didn’t start being used in large quantities until after the Second World War, but it had been discovered quite a while earlier. Othmar Zeidler, an Austrian chemist, first synthesized DDT in 1874. Nobody realized that it
How does a cheetah run so fast? It is a combination of their body weight, their claws, their spine, their joints, the type of muscles they have, their tail, their organs, and the size of their head and skeleton. Cheetahs are the fastest land animals. They have a top speed of approximately 113 km/h and
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What is the immortal jellyfish? It is a jellyfish called Turritopsis dohrnii that can revert to a sexually immature stage in its life and theoretically live forever. There are many organisms that are very long lived. There are plant organisms that are thousands of years old. A colony of quaking aspens is thought to be
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What causes malaria? It is caused by a parasite of the Plasmodium group and it is spread through the bite of a female Anopheles mosquito. The parasite is said to be from a group because there are five different parasites. They are called Plasmodium falciparum, Plasmodium vivax, Plasmodium Malariae, Plasmodium ovale, and Plasmodium knowlesi. The
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What is the biggest plant in the world? The Posidonia australis in Shark Bay, Australia. It is 200 square kilometers, which is 23 square kilometers larger than the city of Washington DC. It is not just the largest plant in the world, it is the largest organism as well. Researchers sampled it in many different
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What do tonsils do? The tonsils contain a lot of white blood cells and they are one of the body’s first lines of defense against infection. Firstly, do you know where your tonsils are? For the whole of my life, I thought the thing hanging down at the back of my throat, just behind the
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What causes dyslexia? It is caused by a difference in the brain parts that process reading, but nobody knows exactly what causes that difference. As an aside, there is a common joke that the word for people who cannot read or spell very easily, dyslexia, is one of the hardest words to read or spell.
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