Urban explorer Steve Duncan goes underground, examining the hidden infrastructure of major cities all over the world: their tunnels, subways and sewers. Late in 2010, NPR's Jacki Lyden joined Duncan and a group of subterranean adventurers in New York. (This story originally aired on All Things Considered on Jan. 2, 2011.)
The NFL has fined Detroit Lions defensive tackle Ndamukong Suh $100,000 for an illegal low block behind an opponent's knee. Suh, twice voted the league's "dirtiest player" by fellow players in a Sporting News poll, is appealing the fine, the largest ever for on-the-field conduct. The question for Suh and fellow athletes is whether fines change behavior.
Human DNA is the ultimate fingerprint. A single hair can contain enough information to determine someone's identity — a feature that's been invaluable for identifying the unnamed casualties of natural disasters and war. But forensic scientists who use DNA say the technology isn't always available where it's most needed, like in poor countries, or in war zones like Syria.