Addicted. This stuff is incredible where you actually educate yourself while you listen. Symphony of Science takes the world's brainiacs, add some vocal effects and makes them into a catchy, bass-filled wonder. I don't think I've heard something that I don't like on the website at symphonyofscience.com. Be sure to check that out and links to downloads available below, remember that all wouldn't be possible without donations. Enjoy!
Downloads (right click / save as)
The Big Beginning
Ode to the Brain!
The Case for Mars
The Poetry of Reality