'Bathtub rings' suggest Titan's dynamic seas

Saturn's moon, Titan, is the only object in the Solar System other than Earth known to have liquid on its surface. While most of the lakes are found around the poles, the dry regions near the equator contain signs of evaporated ...

The strange case of the scuba-diving fly

More than a century ago, American writer Mark Twain observed a curious phenomenon at Mono Lake, just to the east of Yosemite National Park: enormous numbers of small flies would crawl underwater to forage and lay eggs, but ...

Scales are tipping against walleye; time to get hooked on new fish

As lakes across the upper Midwest grow warmer year after year, cool-water species of fish are finding it harder to thrive. In Wisconsin, that trend is especially noticeable in struggling populations of walleye—important ...

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