The earliest microscopes were called flea glasses because they were predominantly used to observe small insects such as fleas!
Fact Lab
Light travels through different mediums before it reaches our eyes. Since its propagation speed depends on the density of the medium, it breaks at the boundary of different densities. The image of objects does not come into our eyes from where they are, but rather from where we think we can see their shape after refraction.
When you look a sheep directly in the eye (if you dare!) you will notice that their pupils are rectangular. This gives them a field of vision of up to 320 degrees, allowing them to see almost everything around them, especially potential predators. Sheep also have an excellent sense of smell.
Crocodiles regenerate teeth. With a specialized groove in their jaws, they can grow new teeth to replace the ones they lose. Throughout their lifetimes, crocodiles can grow and replace thousands of teeth. Some crocodiles live up to and over 70 years.
Fact Lab
Light travels through different mediums before it reaches our eyes. Since its propagation speed depends on the density of the medium, it breaks at the boundary of different densities. The image of objects does not come into our eyes from where they are, but rather from where we think we can see their shape after refraction.
When you look a sheep directly in the eye (if you dare!) you will notice that their pupils are rectangular. This gives them a field of vision of up to 320 degrees, allowing them to see almost everything around them, especially potential predators. Sheep also have an excellent sense of smell.
Crocodiles regenerate teeth. With a specialized groove in their jaws, they can grow new teeth to replace the ones they lose. Throughout their lifetimes, crocodiles can grow and replace thousands of teeth. Some crocodiles live up to and over 70 years.
Everyone has a shadow and everyone`s shadow looks different. Even your own is not the same because it dislays a different image at each time of day, depending on the angle at which the light falls upon you. Have you ever been caught off guard by your own shadow?
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