Idiom of the Day
scratch (someone's) back
to do something for someone in the hope that they will do something for you
"You scratch my back and I`ll scratch yours," the customer said when we talked about the new sales contract.
Fact
The brightest star in history was the supernova of 1054, which formed the Crab Nebula. It was brighter than Venus and bright enough to be seen in daylight and to cast a shadow at night. We know about it through the astronomic records of China and Japan.
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