Best Brain Boosting Web sites?!

What are the 5 web sites recommended in The Brain (DISCOVER presents)?
Answer: Get Smart, the article in the DISCOVER winter 2009 special, written by Adam T Hadhazy recommends http://www.brainist.com/, http://www.fitbrains.com/, http://www.gamesforthebrain.com/, www.brainwaves.com/puzzle-home.html, http://www.brainarena.com/, and http://www.lumosity.com/.
Adam Hadhazy gives the following three of the five the most thumbs up:
1)http://www.fitbrains.com/,
2)http://www.lumosity.com/, and
3) http://www.gamesforthebrain.com/.
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