How does a lava lamp work? There are two principles at work in a lava lamp. The first is how a substance can stay together when surrounded by water. The second is how heat affects the density of a material. The lava lamp that we know today was invented by a British accountant called Edward […]
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How can you 3D print metal? You can 3D print metal in the same way you can 3D print plastic. It has to be melted in some way, shaped, and then allowed to harden. Plastic 3D printing has been around for a while, and there are several different kinds. The cheapest and the most basic
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How does a thermal imaging camera work? A thermal imaging camera works by detecting infrared radiation and then processing it into an image that can be displayed on a screen. Everything on Earth can absorb heat or radiate heat. Mammals, such as us, create our own heat by burning the food we eat to make
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How are undersea Internet cables laid? Undersea Internet cables are basically laid by spooling them off a very large ship. When you use the Internet, your computer has to somehow connect to the server where all of the information for whatever site you are searching for is stored. Those servers are in many different countries,
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How does a hologram work? There are two types of holograms: the version that has a 3D image on a flat sticker, or plate, and the 3D kind that appears in the air out of nowhere. Surface holograms work by splitting light, and 3D ones work through several methods. A flat hologram is an attempt
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How do oxygen masks on a plane work? Oxygen masks on a plane work by initiating a chemical reaction that produces a relatively small supply of oxygen. Hopefully, you will never have to experience the oxygen masks dropping down while you are on a plane. Flying on a plane is still statistically the safest way
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What is a black box made of? There is no one single material, but they have to be able to survive any of the conditions that a crashing aircraft might encounter. We call them black boxes, but they aren’t actually black. In fact, a literally black black box would be very hard to find. They
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How does a 3D movie work? A 3D movie works by having two very slightly different versions of the movie that are filmed a tiny distance apart. We, like most predators, have our eyes at the front of our faces, pointing forwards. Most prey animals have their eyes at the side of the head. The
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How does an earthquake early warning system work? An earthquake early warning system works by detecting the P wave that comes from the earthquake’s epicenter. Earthquakes are caused when tectonic plates jam against each other and then suddenly move. There are three types of tectonic plate boundaries. There are divergent boundaries. These are where two
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How do people breathe on a submarine? Submarines can carry a pressurized air supply, but most modern submarines make oxygen through a process called electrolysis. Producing enough oxygen for all of the people on a submarine isn’t the only thing to consider when trying to keep them alive. The air we breathe is 78 percent
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