Why is human waste falling from India's skies?
In India, as in many other countries around the world, it is considered good luck when a bird poos on you.
But as an unfortunate Indian woman has discovered, there is nothing lucky about being hit by other kinds of falling excrement.
The Times of India reports that Rajrani Gaud from Madhya Pradesh suffered a severe shoulder injury when she was hit by a football-sized chunk of ice last month.
Her injuries could have been much worse, according to eyewitnesses. They say she only avoided being killed because the icy ball crashed into the roof of a house before hitting her.
And the strong suspicion now is that it this chilly projectile was composed of more than just frozen water.
The newspaper claims that aviation scientists believe she may well have had the misfortune to become one of an incredibly rare group: people who have been hit by what the airline industry coyly calls "blue ice".
That's its euphemism for the frozen human waste that very occasionally forms around the overflow outlets for aeroplane toilets, and then falls to earth. "Blue" because of the chemicals added to the toilets in planes to reduce odour and break down the waste.
Blue ice falls are unusual, but not unheard of.
Plane toilets store human waste in special tanks. These are normally disposed of by ground crews once the plane has landed, but international aviation authorities acknowledge that lavatory leaks can occur in the air.