Science websites that you love for reference, entertainment, beauty?
Just reading a thread on birding that had a link to enature.com which I have never come across in my surfing for neat things for my DS5. I searched for one of those "ultimate" threads on this topic but didn't find any, so here goes. I'd love to get links to science sites people love, as I said, for reference, entertainment, beauty. Here are some of mine off the top of my head, I'll have to go digging for other favs.

Beak

http://enature.com
and links therein to all kinds of NASA information, images and video. Discovery going up for the last time today made me teary.
http://www.stellarium.org/ amazing planetarium software that you can download and run. you can zoom in/out, run time in forward and reverse, many more options that I haven't explored.
http://missrumphiuseffect.blogspot.com/p/thematic-book-lists.html great science and nonfiction book recommendations, and fiction as well
http://www5.pbrc.hawaii.edu/microangela/index.html electron microscopy images, limited explanations but beautiful
http://www.tolweb.org/tree/phylogeny.html this site is extensive but still a work in progress. many pages have large link lists to university and museum web resources