Here are a number of great science lessons plans for middle school students.  Enjoy

• Air Bags and Collisions - How Do Airbags Prevent Automobile Injuries?
• Airfoil Experiment 1
• Air Pressure
• Air Pressure - What is Air Pressure and How Can It Be Measured?
• Aircraft Fire Rescue - How Does a Firefighter Put Out an Airplane Fire?
• Altitude Tracking
• Antacid Tablet Race
• Balloon Staging - Rocket Staging
• Balloons - Why Are They Stretchy?
• Battery Life
• Bicycles - How Do a Bike and Its Rider Stay Up?
• Car Engines
• Circus High Wire - How Do Tightrope Walkers Keep Their Balance?
• Colored Shadows - Using Lights to Mix Colors
• Cryogenics - Science - Fact or Science Fiction?
• Demonstrating Dew and Frost
• Domed Stadiums - What Keeps Inflated Stadiums Up?
• The Dry Compass Experiment
• Finger Boomerangs
• Fish Tank Optics
• Flying Tube
• Flying Wing
• Four-Wing Paper Boomerang
• Frisbee Physics - How Does Physics Play a Role in Frisbee Flying?
• Glass Blowing
• Hollywood Stunts
• How a Plane Is Controlled
• How Can I Control the Soccer Ball?
• How Do Clocks Keep Time?
• Human Slingshot Ride - How Does the "Ejector Seat" Ride Work?
• Hypercoaster - How Do You Know a Roller Coaster Is Safe?
• Ice Surfers - How Do They Go So Fast?
• In-Line Skating - Do In-Line Skates Really Go Faster than Roller Skates?
• Inca Engineering - How Did the Incas Build Without Mortar or Wheels?
• Lemon Power
• Liquid Bottle Rocket
• Liquid Nitrogen Fun!
• Locks and Dams - How Do a Lock and Dam make an Unnavigable Part of a Waterway Navigable?
• Luge - How Do Engineering and Technology Play a role in the Olympics?
• Making a Barometer
• Making a Hair Hygrometer
• Making an Air Thermometer
• Making a Straw Woodwind
• Making a Weather Vane
• Making a Wind Anemometer
• Making a Wind Sock
• Making a Wind Vane
• Making Paper Airplane Gliders
• Making a Steam-Powered "Rocket Boat"
• "Maple Seed" Helicopters
• Match Stick Rocket
• McEagle Styrofoam Glider
• Microwave Ovens - What Is the Science Behind Microwave Cooking?
• Mummies - How Are Mummies Able to "Survive" the Tests of Time?
• Musical Tube
• Newton Car
• Paper Rockets
• Peanut Power
• Pencil Rockets
• Ping Pong Ball Curves
• Playing with Polymers
• Propeller Experiment 4
• Propeller Experiment 5
• Riverboats - How Does Steam Power Big Machinery
• Robots
• Rock Climbing - How Can the Human Body Stick to a Sheer Cliff?
• Rocket Car
• Rocket Pinwheel
• Science Safari: Energy Resources
• Scuba Diving
• Sewer Science - Where Does Sewage Go?
• Ski Jumping - How Do Ski Jumpers Go So Far?
• Slinky Physics - How Do Toys Work?
• Soda Pop Can Hero Engine
• Splitting Water - H2O Hydrolysis
• Telecommunications - New Frontiers in Electronic Communications
• Using Bubbles to Learn about Light Interference
• Waterskiing - How Do Water Skis Stay Up?
• The Wet Compass Experiment
• What is Infrared Light and How Does It Work?
• Wooden Helicopter