This Day, That Year – May 1

The Empire State Building finally opened in New York City on this day in 1931.

Did you know that:

• “Penny Black” was the world’s first adhesive postage stamp issued by Great Britain on this day in 1840
• A patent was granted to Nikola Tesla for the “electrical transmission of power” on this day in 1888
• The planet Pluto was officially named by eleven-year-old Venetia Burney on this day in 1930