General fact: 85 is the atomic number of astatine.
Mathematical fact: 85 is the product of two prime numbers (5 and 17), and is therefore a biprime; specifically, the 24th biprime not counting perfect squares.
Trivia: 85 is the IQ and nickname of Aaron in Alien 3.
Historical date: March 25th is the day in 1965 that Civil rights activists led by Martin Luther King, Jr. successfully complete their 4-day 50-mile march from Selma to the capitol in Montgomery, Alabama.