I found this radiometer GIF on the internet. I've had a radiometer for decades, fascinated by the way it spins in the light. It works with sunlight or an incandescent light bulb. I finally decided to order a new one after mine stopped working. Here's a photo from the internet that looks just like mine. Sir William Crroke invented the radiometer. Below are explanations about how it works. It's not so simple! ==================================== "The radiometer is made from a glass bulb from which much of the air has been removed to form a partial vacuum . Inside the bulb, on a low friction spindle, is a rotor with several (usually four) vertical lightweight vanes spaced equally around the axis. The vanes are polished or white on one side and black on the other. When exposed to sunlight , artificial light, or infrared radiation (even the heat of a hand nearby can be enough), the vanes turn with no apparent motive power, the d
10 Animals That Suspiciously Earned Human Credentials
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Some animals are just a bit more incredible than others. While most of our
favorite creatures, like dogs and cats, are simply content to hang out at
home...
2 hours ago