I've browsed through several On-this-day pages, and have concluded that these are the most interesting facts for January 23
1556 - Deadliest recorded earthquake in history, Shaanxi Earthquake, kills 830,000 people in Sensi province of China
1789 - Georgetown University is founded, becoming the first ever Catholic University in the United States
1856 - Tunisia abolishes slavery
1870 - Marias Massacre in which US cavalry men kill 173 native Americans in Montana, most of whom are women and children
1942 - Japan commences its invasion of Australia
1973 - Richard Nixon announces that a peace accord has been reached in Vietnam
1989 - Salvador Dali dies
