New discoveries are happening all the time ... what's going on in the world of science that's exciting to you?

It's all Brink all the time. Talk about the show and Josh's hair. Tell us how you're a Brinker.

Three skilled challengers have 48 hours to invent, design and build a contraption that will save the cherished prize. If they can catch their prize, they can keep it.

Have a cosmic chat about Carl Sagan, or your favorite episode of Cosmos.

Science Channel's Ecopolis explores new technologies that could reshape the environmental impact of the future megacity. Here's your place to talk about the show and ask questions. Then check back to see answers provided by some of the experts featured in the program.

Tell us your favorite sci-fi films. Or film moments. And which sleepers deserve more recognition?

What's working, what's not working, and what's altogether missing from the network?

Why is the old "Beer before liquor" adage true? Have any bathtub remedies for those pounding headaches? Post your potent potable wisdom here!

You've seen our list, but this is the place to add your own.

Post your ideas for future episodes of the series and comment about the show in general.

Post your ideas for future episodes of the series and comment about the show in general.

Talk about the guys, the show, and what you've done to make the world a greener place.

Are you ... irate with your iPod, confounded by camcorders or chagrined by your cell phone? New York Times tech columnist David Pogue is here to unravel the mystery behind the complex gadgets that dominate our daily lives. Post your questions in this forum and David will drop in from time to time to help decode (some) of your digital dilemmas.

What's your favorite part of the show? Would you volunteer to go to Mars?

In search of extraterrestrial treasures, the Meteorite Men are on the hunt for space rocks — buried for thousands of years and older than the planet Earth!

NASA researchers have discovered vast clouds of methane on Mars. The find triggered speculation that the gas is being produced by microbial life forms on the Red Planet, though geologic processes might also be the source. Read more.

Heading to a Dorkbot or Nerd Night? Got news on a geek gadget? Check out the Nerdabout Website and then tip our bloggers here!

Did you get to Punkin Chunkin this year? Are you a backyard tinkerer who'd like to build your own trebuchet? Here's the place to catch up and meet some fellow fans!

It's fun to be scared ... sometimes. But have you come face to face with the undead and lived to tell the tale? Share your story here.

Here's your chance to chat about the theoretical forces of the universe. Does string theory hold all the answers? Or is there something even more fantastical out there?

Sound off on the latest episode of Cosmos, Survivorman and other Science Channel shows.

From Animal Connections to Unsung Inventions, it's the Science Channel's Top 10s. Click here to check out the list and then come back and discuss.

Do you see music? Or taste words? Then you may have synesthesia. Tell us about it.

It's a cyber-history celebration. From college-nerd Bill Gates to the Age of Blogs, talk about the history of the Net here!

Scotland Yard is stumped - who do you think is Jack the Ripper? Do you have any idea as to who killed King Tut? Share your hunches about these and other unsolved mysteries here.

Do you like your creatures weird? Chat about the show and your guide, Nick Baker.