A decent set of "explanatory" articles over popular science topics. Many of the articles carry rather relevant material to connect with specific standards along the way...
This is more than pure neuroscience. There are all sorts of options for looking at general physiology, scientific processes, etc. Save this site for sure. If I were back in the classroom, I would go crazy in the "store" section. Or rather, I would compel my supervisor to "go crazy" in that store. Such a well done set of resources as well...
The emerging set of interactive simulations at PhET that now use HTML5 and work solely within a modern browser. These are heavy in the physical sciences... but also include acid-base, atomic structure, chemical equations, etc.
i tried this demo for the first time this year. It didn't work perfectly but it really gave the students a visual of the formation of minerals. I would suggest marking the water level on the jar when you first set it up so they can really grasp how much has evaporated by the end. I let mine sit for almost 3 weeks but crystals were forming within 3 days.
I think a key element to the credibility of this set of resources is that they were curated/produced by the Science Education Resource Center (SERC) at Carleton College and its partners with funding from the National Science Foundation.
This is cool! Leads students through questions to identify their material. The students will have to test the hardness, cleavage, streak, etc. as they enter their data into this app.