• Vin Diesel talks to Gamespot about the next Riddick movie -- and it looks like screenwriter David Twohy is on board.

• io9 lists several scifi reasons why the dinosaurs might have been wiped out. I like the time-traveling hunters idea, as fronted by Arthur C. Clarke and Calvin.

• Kim Stanley Robinson's classic tale of Martian colonization, Red Mars, is now available for free ebook download.

• What super villain has been hit hardest by our economic recession? Lex Luthor, of course, as personified by Mad Men's Jon Hamm.

• Douglas Adams' Hitchhiker's Guide to the Galaxy is getting a sixth part thanks to Eoin Colfer, author of the Artemis Fowl books.

• Michael Cassutt explains how Star Trek's and Battlestar Galactica's word-building has changed the frakking world.

• SF Signal applies spray paint to sock, then huffs: Why the Star Wars prequels are actually good.