15th June 1215 – King John of England put his seal to the Magna Carta. 1667 – The first human blood transfusion was administered by Dr. Jean-Baptiste Denys. 1752 – Benjamin Franklin proved that lightning is electricity. 1785 – Jean-François Pilâtre de Rozier, co-pilot of the first-ever manned flight (1783), and his companion, Pierre Romain, […]