What are quantum dots? Quantum dots are nanocrystals that can be used as semiconductors. You might find them in your TV screen, among many other things. Different size quantum dots produce different colors. Quantum dots are called quantum dots because they are so small. They are basically nanoparticles. The smallest ones are 2 nanometers across […]
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How does regenerative braking work? Regenerative braking works by converting the kinetic energy of the moving car back into electrical energy that can be stored in the battery. Regenerative braking is mostly used by electric cars or hybrid cars, and it is a way of recovering energy. Electric trains use it as well. Let’s look
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Could a perpetual motion machine be possible? No, because any perpetual motion machine would break the laws of thermodynamics. The definition of a machine is a device used to perform a task. Any perpetual motion machine has to be able to perform work to be a machine. There are a lot of people that say
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Could teleportation be possible? In theory, teleportation could be possible, but in practice, it isn’t. When I say that something isn’t possible, I mean with current technology or the technology that is likely to be around in the future. There is obviously no way of knowing what kind of advances might appear in the future,
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What are self-healing materials? Self-healing materials are materials that can detect when they have been broken and then repair themselves without any human intervention. In essence, our skin and bones are self-healing materials because they know when they have been damaged and can repair themselves when cut without needing any external support. The majority of
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How would a Dyson sphere work? A Dyson sphere would work by capturing the energy output from the sun and transmitting it to Earth. It would probably be a series of satellites. A Dyson sphere is obviously hypothetical because we don’t have the technology available to make it. However, that isn’t to say that we
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What is Moravec’s paradox? Moravec’s paradox is that AI machines find it very easy to do things that we find difficult, such as chess, but very difficult to do things that we find easy, such as tying a shoelace. The paradox has Hans Moravec’s name, but he wasn’t the only person to notice this. He
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What does a fuse do? A fuse is there to protect an electrical system from an overload by cutting off the power. These days, we have multiple electrical circuits in our houses that operate numerous devices. Unless we have solar panels or our own generators, we get the power from an electricity power station. There
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What is a smart bullet? A smart bullet is a projectile that is able to alter its trajectory after it has been fired. Smart bullets sound scary, but they could have benefits. A lot of deaths in warfare come from collateral damage. There are accidental shootings by the police as well. Smart bullets would be
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Why do cold batteries lose their charge? Cold batteries don’t lose their charge exactly. In colder weather, the atoms that are inside the batteries can’t move as much and that means they can’t produce as much power. You may have noticed that if you use your phone on a particularly cold day, it runs out
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