What is the difference between slugs and snails? There are several differences but a big one is that snails have a coiled shell on their backs and slugs have a soft shell underneath their flesh. Snails and slugs have a lot more similarities than they have differences. Let’s look at the similarities first. Both snails […]
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What causes a stroke? There are different types of strokes, but the most common is an ischemic stroke and it is caused by a blockage in one of the blood vessels in the brain. The brain has a huge oxygen requirement. It is only 2% of your bodyweight, but it uses 15 to 20% of
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Too busy to read? Watch on YouTube Why do ducks float? They float because of their center of gravity, their hollow bones, the air in their feathers and air sacs, and the oil on their feathers. Whether or not something floats has to do with the object’s density and the buoyancy of water. Water has
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Too busy to read? Watch on YouTube Are ants and termites the same thing? No. They belong to different insect orders. Termites are from the Isoptera order and ants are from the Hymenoptera order. Termites and ants are easily confused and they have a lot of similarities, but they have a lot of differences as
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Watch on YouTube How do facial expressions work? There are 20 muscles in the face that can be moved in different combinations. There are two kinds of facial expressions: voluntary and involuntary. A lot of study has gone into reading facial expressions and there are many theories about whether they reveal inner thinking or not.
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Watch on YouTube Why does blood show up under UV light? Because it absorbs all of the light and appears completely black. When we watch crime movies, the police often use a black light to show stains at the murder scene. Well, a black light will make many bodily fluids glow, but it won’t make
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Watch on YouTube Why do stick insects look like plants? They have evolved to resemble the plants they live and feed on, in order not to be eaten by birds and other animals. Stick insects are a wonderful example of natural selection at work. There are over 6,000 species of stick insect in the world,
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Watch on YouTube How quickly do bones biodegrade? It depends on what kind of soil they are buried in, but from 6 years to thousands of years. The bones we have of dinosaurs are not actually bones but fossils. If a dinosaur dies in the right conditions, minerals can replace the calcium in the bones,
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Watch on YouTube Why is carbon-based life common? Because carbon can bond with many different elements to allow chemical reactions to happen. On our planet all living things contain carbon. There may be lifeforms on other planets that are made of different elements but on Earth, everything uses carbon in one way or another. Plants,
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Watch this on YouTube How do spiders make webs? By producing silk from their bodies and weaving it into a strong web. There are two parts to this question: how do spiders produce silk and how do they make their webs. Let’s look at how they make silk first. Spiders are able to produce silk
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