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Summary via The Scout Report (Apr 2012): "After watching this erudite (and fun) program from NOVA, you'll never again wonder "Where's selenium?" This two-hour program is hosted by David Pogue (the host of NOVA's "Making Stuff" program) and it "spins viewers through the world of weird, extreme chemistry: the strongest acids, the deadliest poisons, the universe's most abundant elements, and the rarest of the rare." It's a fascinating way to learn about the history of the periodic table, and the discovery and properties of the elements. The site also contains fourteen additional features, such as the Name That Element! quiz, an iPad app, a chemical bonds quiz, an interactive periodic table, and an exploration of the "amazing atomic clock." It may make chemistry junkies out of neophytes, and the already-converted will find much to keep them occupied here. [KMG]"

Besides the basic "Free Rice" -- where students practice vocabulary and earn rice for the World Food Programme -- they can also choose from subjects:  Art, English, Chemistry, Geography, Language Learning, and Math

This set of tutorials were made using Doceri app for the iPad and Mac.

Free, open content geared toward high school students.

Visual interactive display of the size and scale of cells -- with the starting point the "large" coffee bean (12 x 8 mm).....\nOne page of a broader educational website from the Univ of Utah, Genetic Science Learning Center -- other pages are definitely middle/secondary school (if not univ) level...\n<

"Welcome to Reeko's Mad Scientist Lab. Your source of free science projects and experiments for parents, teachers, and children of all ages. Kick off your shoes. Pull up a chair. Make yourself comfortable. Oh yeah, did we mention that protective goggles are required... "

EARCOS 2011 presentation -- a Google Doc

Some very useful infographics under CC licence.