@JeshiRu 11 February 2021 more from that month

Famous Scientists Archimedes The Greek mathematician, physicist, astronomer and inventor Archimedes (c. 287–212 BC) was one of the greatest scientists of the classical age. Among many inventions and mathematical advances, Archimedes calculated an accurate estimate of π (pi), the ratio between a circle's diameter and its circumference (edge). Pi is used today in many areas of mathematics, science and engineering. Archimedes is best known for what has become known as “Archimedes’ Principle”. He was given the task of determining whether a goldsmith was stealing gold during the making of a golden wreath, replacing it with a cheap—and less dense—alloy. Archimedes took a bath and realised from the rise of the water when he got in that he could calculate the volume of the gold wreath by immersing it in a bath and measuring the amount of water it displaced. Now he could compare its volume with its mass and prove whether or not it was made entirely of gold. Archimedes leapt from his bath and went running naked through the streets shouting "Eureka!" ("I have found it!").