Students observe a machine closely from several angles while it operates. Identify the elements of machines combined in different gadgets. Create a clear diagram of how a machine works.

This site from the Museum of Science provides links to all aspects of the museum. An on-line exhibit and a link for educator tools are offered.

A 34-page student journal of worksheets to accompany a instructional activity unit on designing buildings that will withstand an earthquake. [SEE: http://eie.org/sites/default/files/es_educator_guide_2014_10_09.pdf] First, they work on...

Follow these illustrated, step-by-step instructions to use chromatography as a tool in identifying a mystery candy.

A set of four station activities involving static electricity that can easily be done in the classroom.

An activity where students simulate the process of extracting coal from the ground using chocolate chip cookies. They then calculate the costs involved to determine whether coal mining is profitable.

Become an engineer, and design a submarine that moves in the water like a real submarine. Try making it sink, float, and hover in the water.

Step-by-step illustrated instructions showing how to drop four eggs into four cups without touching them. Demonstrates the concept of inertia according to Newton's first law of motion.

An experiment where students remove DNA from strawberries using everyday materials.

Step-by-step instructions, with photos, of how to construct a hot-air balloon from tissue paper, to demonstrate that heated air expands, creating a convection current. This activity requires the use of a hot air gun and is labor-intensive.

Clear instructions, with a photo of each step, explaining how to make a 'worm farm' in a large jar.

A short piece on Leonardo da Vinci from the Science Learning Network. Placed here because a) there's a decent drawing of an Archimedes' screw, and b) there's a link to an adequate definition thereof.