This episode is presented by eBay.

Rob, everyone loves a deal and a bargain from time to time, don't they? Absolutely, mate. And you know where you can grab a great deal? Talk to me. Where? The eBay app. Yes, you are correct. You didn't need to talk to me. I already knew it. I love eBay. When you're buying, you can discover loads of hidden gems. there's so many items where you think I would have never found that anywhere else.

Then when you're buying, you can discover loads of hidden gems. There's so many items where you think I would have never found that anywhere else. Then when you're selling, it's so simple and most

importantly, free. It's free, Rob. When it's this easy to sell for free and there's great deals

on things you love. You can't help but say when it's eBay. It excludes vehicles and business

sellers.

Welcome to Science Talk, the weekly podcast of Scientific American, posted on February 27, 2010.

I'm Steve Murksky. If you've been listening to this podcast on our daily offering 60 Second Science,

you know that I was recently at one of the major science conferences of the year, the meeting of the American Association for the Advancement of Science, as were a couple of

other Siam staffers, Mark Fischetti, and Robin Lloyd.

Once we got settled back in our New York offices, Mark, Robin, and I sat down and talked about

just a few of the

conference sessions we've gone to, after which we'll test your knowledge of some recent

science in the news. First up, me, Mark, and Robin.

So, Mark, what were some of the things, if anything, at the AAAS meeting that got you excited

for the future?

Well, I sat in on a number of the climate-related sessions.

One of them was a long session on algae, and there was a growing perception that algae fuel,

biofuel derived from algae, really wasn't going to make a lot of sense because of the number of inputs that are needed,

nutrients, carbon dioxide, where are you going to get all the carbon dioxide to feed this algae

so that it will produce biofuels?

And interestingly, there does seem to be a growing solution, or at least the sense of how to solve this,

...