Today in History – 20 April
1993 Uranus passes Neptune (once every 171 years)
1940 1st electron microscope demonstrated (RCA), Philadelphia, Pa
1926 1st check sent by radio facsimile transmission across Atlantic
1879 1st mobile home (horse drawn) used in a journey from London and Cyprus
1841 1st detective story (Poe’s “Murders in Rue Morgue”) published
ClicksandWrites 