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Host Audie Cornish talks with Drew Gronewold, a hydrologist at the National Oceanic and Atmospheric Administration, about why water levels in lakes Superior, Michigan and Huron are rising.

Small earthquakes in Ohio and Arkansas associated with hydraulic fracturing for natural gas have taken many people by surprise. Gas industry executives say there's no hard evidence that their activities are causing these quakes. But some scientists say it's certainly possible; in fact, people have been causing quakes for years.

There's a new, invasive species threatening Florida wildlife in the Everglades. It's the Argentine black and white tegu, which can grow to more than five feet and has teeth.

About 100 tons of marine life rode aboard the huge concrete dock that washed ashore in Oregon earlier this week. Marine biologists were shocked to see that Japanese coastal species survived the trans-Pacific trek, but they are also worried about the risk for invasive species.

This summer, a businessman in an Oregon college town commissioned a huge mural depicting a Tibetan monk setting himself on fire. Soon after the mural went up, the Chinese consulate in San Francisco sent a letter to the city's mayor insisting it be removed before it "tainted" U.S.-China relations.

Huge. And large enough to see a massive approaching predator, like a sperm whale. But finding this out was no easy task; giant squids are mysterious creatures and it's hard to get accurate measurements.

Superstorm Sandy caused billions of dollars of damage, washing away houses, boardwalks and boats. But it also washed away dunes that protect coastal communities, literally redrawing the map.

Up to three feet of snow has fallen over much of the East Coast, and areas in New Jersey and Delaware have seen record flooding — even higher than the surging waters of Hurricane Sandy.

New Orleans is working hard to get back on its feet, but its inhabitants -- including residents of Honeysuckle Lane -- continue to be frustrated with the lack of electricity, water and other basic services.

A motorist drove into a crowd that was waiting at a bus stop near a migrant shelter in Brownsville, according to authorities. "It is looking more and more like an intentional act," police said.