How do escalators move at almost the same speed when they are empty and when they are fully loaded? Escalators can move at almost the same speed no matter how much weight is on them because their motors are designed to run at a steady speed and produce more torque when the load increases. Chairlifts […]
How can you save data in glass? Data can be saved in glass by using an ultrafast laser to write tiny permanent marks inside it. It is also called 5D storage. Those marks are far too small to see with the naked eye, but they can still be read later because they change the way
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How could you build a base on the moon? There are several problems involved with building a moonbase, but the biggest one is how to get all of the materials up there. NASA has just announced that they are going to spend $20 billion to put a base on the moon within the next seven
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How does a jet engine work? A jet engine works by mixing fuel with compressed air and then burning it. The gas expands, shooting out of the back of the engine, which pushes the plane forwards. At first glance, it would be difficult to understand how a jet engine moves a plane along. We naturally
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How do planes take off and land on an aircraft carrier? Planes take off on an aircraft carrier by using a catapult, and they land by using a hook. Planes take off from an aircraft carrier by using a high-powered catapult. To fly, an airplane needs to have air move over its wings at a
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What are perovskite solar cells? Perovskite solar cells are a type of solar cell that could potentially replace regular solar cells because they are thin, lightweight, cheap to make, and potentially very efficient. There are different types of solar panel technology at the moment, but the majority of them work with silicon semiconductors. Silicon is
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What is a traffic light green wave? A traffic light green wave is a system where traffic lights are coordinated so that lights turn green in sequence to allow cars travelling at a specific speed to pass through without stopping, thereby reducing the overall congestion in the city. It is difficult to know how many
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What is an avalanche airbag? An avalanche airbag is a backpack that contains an inflatable balloon to increase the wearer’s volume. An avalanche happens when the snowpack separates from the ground and is pulled down the mountain by gravity. They can happen when there has been heavy snowfall, and the snowpack becomes too heavy to
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How can you focus on smart contact lenses? Smart contact lenses have sensors that can track your eye movements and the dilation of the pupil. They can automatically adjust their focus until you are able to see them. And they project the image directly onto your retina. If you are like me, your eyes are
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How does projection mapping work? Projection mapping works by using very powerful projectors and software that can map the shapes and angles of the object to be projected upon. You may need two things to do projection mapping. The first is an incredibly powerful projector, or several very powerful projectors for larger venues. The power
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