NPR News

What gunk lurks in the bathroom sink drain? A fungus that can cause infections in humans, for one thing.

The fungus in question (genus Fusarium) can cause sinus infections and funky toenails. On rare occasions it kills people with weak immune systems. More recently, it has caused serious eye infections in people who wear contact lenses.

Good morning.

If you're just getting into the swing of things after a long Christmas weekend, welcome back. If you're still on vacation, we're jealous.

Our early headlines:

-- Activists Condemn Syrian Army's 'Show,' Say Tanks Didn't Move Far.

This week on Fresh Air, we're marking the year's end by revisiting some of the most memorable conversations we've had in 2011. This interview was originally broadcast on September 19, 2011.

This week on Fresh Air, we're marking the year's end by revisiting some of the most memorable conversations we've had in 2011. This interview was originally broadcast on September 12, 2011.

With just one week until the caucuses, Republican presidential candidates will be everywhere in Iowa this week. Newt Gingrich, Michele Bachmann, Rick Perry and Mitt Romney are all riding buses around the state while Ron Paul makes multiple appearances — a last-minute bid to motivate Republicans to come out and vote for them next Tuesday.

But no candidate has spent more time in Iowa than former Pennsylvania Sen. Rick Santorum. The day after Christmas was a holiday for most, so Santorum went hunting — with cameras.