Event:
New Zealand professional golfer Lydia Ko, age 17, becomes the youngest No. 1 ranked golfer in the world, beating the record set by Tiger Woods in 1997 at age 21
More Notable Events on January 31:
1992 Sportscaster Howard Cosell retires
1991 Nugget's Michael Adams becomes shortest NBA player to get a triple-double
1982 10 Arabian oryx, extinct except in zoos, released in Oman
1982 U.S. Male Figure Skating championship won by Scott Hamilton
1851 Gail Borden announces invention of evaporated milk
