5 Things You Should Know Today: July 21

1. Today will be partly sunny with a high near 90 and a low near 70 degrees. There is a 30 percent chance of showers and thunderstorms, according to the National Weather Service.

2. Today is the start of the season-ending for the Oakdale Athletic Association Rookies baseball tournament at Walton Park.

3. On this day in 1989 the sitcom actress Rebecca Shaeffer was murdered, which later promted anti-stalking legislation.

4. Actor Robin Williams turns 60 years old. 

5. The world's lowest temperature is recorded at Vostok Station, Antarctica at -128.6 degrees Fahrenheit.