The events and anniversaries: Science: 1897 - Guglielmo Marconi patents the radio in London. Military Aviation: 1900 - First "Zeppelin" airship flight on Lake Constance near Friedrichshafen, Germany. Civil Aviation: 1937 - Amelia Earhart and navigator Fred Noonan disappear over the Pacific Ocean while attempting to make the first equatorial round-the-world flight. Report: 1947 - An object speculated...