| Isaac Asimov, scientist-writer, The Laws of Robotics | |
| Betsy Ross Day | |
| Earth at perihelion | |
| Quadrantid meteor shower, radiant in Bo”tes | |
| first American revolutionary flag displayed. | |
| Georgia is 4th state to ratify US constitution | |
| World's Columbian Exposition opens in Chicago | |
| DeYoung Museum in San Francisco's Golden Gate Park opens. | |
| first electron tube described, St Louis, Missouri | |
| USSR launches Mechta, 1st lunar probe & artificial in solar orbit | |
| Dr Christian Barnard performs 1st successful heart transplant | |
| Mariner 9 begins mapping Mars | |
By Scott Labrecque version 9.4.0.0