Science News for Kids - http://www.sciencenewsforkids.org/
Science Friday (Lot's video and audio clips) - http://www.sciencefriday.com/
Science Daily (Use this link if you want a challenge) - http://www.sciencedaily.com/
Note: If you're going on the DC trip you are excused from this homework. If you feel like challenging yourself feel free to complete it.