May 20 in Pop Culture History
1873 – Levi Strauss and Jacob W Davis patented (#139,121) copper-riveted jeans, designed to help prevent tears in the fabric.
1883 – Krakatoa began to erupt; the volcano exploding three months later, killing more than 36,000 people.
1899 – The American Physical Society was founded at Columbia University.
1901 – Claude Grivolas patented (French) a projector for three-dimensional (stereoscopic) movies viewed wearing spectacles with one red and one blue …