Use "secret" hand signals to have students SHOW you what they need. Each finger means something different, so the teacher can differentiate what kids need when there are 7 hands raised! Great classroom management technique for nonverbal communication.
10 Ways to Sabotage Your Classroom Managment: If you are having classroom management problems, take a look at this article, which explains what NOT to do, and the more effective practices you should try instead.
How to differentiate without planning 30 individual lessons!
SCIENCE FUN~ Seesaw Science: The Hammer-Ruler Trick is from Scientific American. They have several science-related activities that are fun for children. Adults will find easy-to-follow instructions and simple materials lists, as well as additional background to help them explain the key scientific concepts. Great resource!