Great interactive graphic from the U of Utah that shows the size of things (giant coffee bean off-screen to the left here; grain of salt lower right)
This is a ridiculously well organized collection of links for teachers… sorted by subject, and then more specific subject. You ought to check it out and browse.
This site has “closed”, but they will remain open and viewable for another 3 years. Apparently they lost funding. Let’s take advantage of it while we can. I have a suspicion that they will find funding to maintain the site beyond three years. Time will tell.
Apple’s homepage for apps that deliver media-rich resources for just about every academic subject – a must-visit as you plan your i-pad enabled courses.
One of many truly interactive periodic tables online. So much you can do with each element, or the whole table, just by scrolling over. For this example screenshot, I clicked on Hydrogen, and launched the little window with lots of key facts about the element.