5 Useful Things To Know Today: May 21

1. We hope you enjoyed the great weekend weather. It's really starting to feel like spring or early summer. Unfortunately that sunshine is expected to turn wet today. There is a 40 percent chance of rain with showers expected throughout the day. High temperatures will approach the mid-70s.

2. Ever wanted to ask a police officer a question? about laws you are curious about, how often they patrol your neighborhood and why you got that ticket! 

3. Gaithersburg Book Festival: For those who attended Saturday's book festival we hope you had a good time. We'll have a story and photos/video today or tomorrow. For now, catch up on Q&A's from last week about the event:

4. In case you missed it—: Teen substance abuse now is similar to the problems of 1993, when authorities were called to action to combat teen drinking and driving, police said.

5. On this day in history: Clara Barton founded what became the American Red Cross in 1881. Amelia Earhart became the first woman to fly solo across the Atlantic Ocean (from Newfoundland to Ireland) in 1932.