The coldest recorded temperature on Earth was -89.2 degrees Celsius in Antarctica.
Why it is true
This record was measured at the Vostok Station in 1983, representing extreme conditions where air can cause instant frostbite.
Source: Climatology
Would you rather be asked first?
This is the reading side of the site, so the answer is in the sentence above — that is the whole point of it. Test yourself works the other way round: the question comes on its own, and the fact and the explanation only appear once you have answered.