April 23

Tax Freedom Day® falls on April 23 in 2008. 1858: Max Planck, who introduced quantum theory to the world, was born. 1896: The Vitascope system for projecting movies onto a screen, invented by Francis Jenkins and Thomas Armat, was demonstrated in New York City. 1915: The A.C.A. became the National Advisory Council on Aeronautics (NACA), which later became NASA. 1940: The Ray-o-Vac leak-proof flashlight battery was patented by Herman Anthony. 1955: Congress ordered all U.S. coins to bear motto "In God We Trust." 1960: Nobel Prize winner Max Von Laue, who discovered the diffraction of x-rays in crystals, died. 1968: The first decimal coins were distributed in Britain in preparation for replacing the current system of pounds, shillings and pence. 1985: Coca-Cola Co. announced it was changing the secret formula for Coke. 1994: The subatomic particle called the top quark was discovered at the DoE's Energy's Fermi National Accelerator Lab.