On This Day: August 6. Daily podcast of historical and noteworthy activity on this calendar day. NASA's Curiosity rover lands on Mars; US drops atomic bomb on Hiroshima, Japan

On This Day: August 21. Daily podcast of historical and noteworthy activity on this calendar day. Lincoln-Douglas debates; Hawaii becomes 50th US state; Nat Turner led an unsuccessful slave rebellion

On This Day: August 3. Daily podcast of historical and noteworthy activity on this calendar day. Birth of Martha Stewart; voyage of atomic submarine Nautilus; Christopher Columbus began the first of four transatlantic voyages.

On This Day: August 7. Daily podcast of historical and noteworthy activity on this calendar day. 1st murder by Jack the Ripper committed, Ke$ha hit song "Tik Tok" released, death of Oliver Hardy.

On This Day: May 11. Daily podcast of historical and noteworthy activity on this calendar day. Deep Blue defeats Garry Kasparov; Adolf Eichmann captured; HMS Beagle launched; Bikini Atoll nuclear-weapons tests

On This Day: September 17. Daily podcast of historical and noteworthy activity on this calendar day. First Occupy Wall Street protest held in the US; assassination of Greve Folke Bernadotte; Camp David Accords completed.

On This Day: July 6. Daily podcast of historical and noteworthy activity on this calendar day. Althea Gibson is first Black person to win Wimbledon; activist Marsha P. Johnson was found dead; Louis Pasteur performs first rabies vaccination.

On This Day: May 13. Daily podcast of historical and noteworthy activity on this calendar day. Pope John Paul II is shot; Dr. Joyce Brothers wins The $64K Question; birth of Stevie Wonder, Dennis Rodman, Stephen Colbert, Lena Dunham, and Richie Valens

On This Day: July 10. Daily podcast of historical and noteworthy activity on this calendar day. Birth of Mary McLeod Bethune; birth of Mel Blanc; Scopes Trial begins in Dayton, Tennessee.

On This Day: May 9. Daily podcast of historical and noteworthy activity on this calendar day. Impeachment proceedings against Richard Nixon; birth control; Mother's Day; Christopher Columbus

On This Day: May 14. Daily podcast of historical and noteworthy activity on this calendar day. Lewis and Clark expedition; Skylab 1; small pox vaccination; State of Israel; Frank Sinatra; Facebook; George Lucas; BB King; Rita Hayworth

On This Day: August 18. Daily podcast of historical and noteworthy activity on this calendar day. Death of Genghis Kahn; birth of Patrick Swayze, Roberto Clemente, Robert Redford, and Virginia Dare; death of Subhas Chandra Bose.