This webpage has a huge collection of wonderfully clean, straightforward interactive websites for science: energy, electrical circuits,, forces, simple machines, animal classification, life systems (plants & animals, matter, earth and space
Inside the 4th grader's brain
Article: Inside a fourth-grader's brain. Insights about neuroscience/development. Also includes links to other grade levels!
13.05.17_Antonio Candido_10 livros para conhecer o Brasil
If you have never visited Mr. Nussbaum you should. He offers extremely high quality games, tools and interactives for math, social studies, language arts, science and much more. Free!