* ''None yet''Harry Grindell Matthews attempts to demonstrate his "death ray" to the War Office. * U.S. Army pilots complete the first aerial circumnavigation of the globe, taking 175 days and 74 stops. * Astronomer Edwin Hubble announces that Andromeda, previously believed to be a [[nebula]], is actually another [[galaxy]]. <br> He adds his theory that the [[Milky Way Galaxy|Milky Way]] is only one of many such galaxies in the [[universe]].