ionising radiation

What really happens at airport security – and what the scanners can actually see

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In the 1970s, scanners were introduced at airports to combat hijackings – Getty Images The conveyor belt security scanners at airports are always a source of irritation. You slipped through unhindered, and now you’ve reached a sticking point: someone forgot to put their liquids in a plastic bag; someone else takes eight different electrical appliances … Read more

James Webb Space Telescope finds dwarf galaxies with enough power to reshape the entire early universe

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Astronomers have used the James Webb Space Telescope (JWST) and predicted an effect by Albert Einstein more than 100 years ago to discover that small galaxies packed a huge punch in the early cosmos, forming the entire universe when it was less than 1 billion years old. The international team found that the galaxies, which … Read more