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Ever wondered what happens to human waste on an aeroplane? Obviously it doesn't just get dumped out of the plane whenever one of the toilets is flushed. It's actually stored in tanks.
But a recent incident in the village of Fazilpur Badlia in India's northern state of Haryana saw a mysterious 10-12kg (22lbs-26lbs) chunk of ice fall from the sky.
At first, some residents - who heard the item land with a 'big thud' - told the BBC they thought it was an 'extra-terrestrial' object, but upon further inspection it seems that it was actually a frozen ball of human waste.
Senior Gurgaon official Vivek Kalia told the BBC that a sample of the mysterious asteroid has been sent for chemical analysis, but that they 'suspect strongly' it's little more than a giant ball of frozen airline excrement.
"It was a very heavy icy ball of ice which dropped from the skies early on Saturday morning," he said. "There was big thud and people of the village came running out of their homes to find out what had happened.
"Some villagers thought it was an extra-terrestrial object. Others thought it was some celestial rock and I've heard that they took samples home."
However, a senior official of the Indian Meteorological Department examined a small sample and said that it was 'definitely not a meteorological phenomenon'.
It doesn't seem to have been done on purpose, either - especially because, back in December 2016, an Indian court ruled that airlines in India would be fined if their planes release human waste from toilets in the air.
Which totally seems fair enough to us. Now, airlines have to wait to land before they can dispose of the swill of piss and shit from their passengers, which is probably the best rule we've ever heard.
So it seems this ball of ice - let's just call it ice - occurred because, when planes fly at high altitudes, the sub-zero temperatures outside cause liquid to immediately freeze. The ice then breaks off the plane and falls to the ground, though it usually melts.
Occasionally, however, frozen human waste - known as 'blue ice' because of the chemicals used to reduce odour and break down the waste - will form around the overflow outlet for aeroplane toilets and then fall to earth.
Thankfully, it doesn't seem to happen all that often. According to Britain's Civil Aviation Authority, around 25 falls of blue ice' are reported every year. With a total of 2.5 million flights a year over UK airspace, that's not a bad percentage. It's still totally gross though.
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