<human>:  When was the first time that the square root of 2 was calculated?
<bot>: The square root of 2 was first calculated in the 17th century. It was discovered by John Wallis, a mathematician and physicist. Wallis was trying to calculate the area of a circle when he noticed that the square of the radius was the same as the area of the circle. He then tried to solve for the radius in terms of the area, and discovered that the square root of 2 was the answer.