Because mercury can damage the central nervous system, kidneys and liver. Both high level/short-term and low level/long-term exposures can lead to serious health problems. This is why they removed thermometers containing mercury from the market.
Mercury is very toxic and harms the brain and nerves. There are many things that can harm you and we’re usually safe, it’s just that mercury is a liquid so it tends to get everywhere if things go wrong. Therefore we don’t tend to play with mercury any more 😕
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