【How-to】When was the first microwave invented

On this day, May 20, in 1873, Strauss and his partner, Jacob Davis, were given a patent for work pants strengthened with rivets—the first example of what we now know as blue jeans. By 1950, per TIME’s count, Levi’s had made 95 million pairs. (The going rate in 1950 was $3.50 a pop.) As for Strauss, he died in 1902.