Idiom of the Day
by the hour
after each hour, one hour at a time
We had to pay for our parking space by the hour.
Science Facts
During the First World War, goldfish were used to check whether all traces of poisonous gas had been washed out of gas masks. The mask was rinsed and filled with water, then a goldfish was dropped in. If it died, there was still gas left in it.
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