What keeps Pluto's ocean from freezing?

When NASA's New Horizons spacecraft flew past Pluto in 2015, researchers hoped that its data would help them unravel some of the dwarf planet's mysteries. Instead, the discoveries made during the close-up look at Pluto and its moon Charon revealed more questions that needed answering.

SeaWorld publishes decades of orca data to help wild whales

The theme-park company SeaWorld has published new data from its captive killer whales - information that scientists say could help inform how they go about trying to save sick or stranded orcas in the Pacific Northwest and elsewhere.     

FDA proposes new fluoride standard for bottled water

The US Food and Drug Administration is proposing a lower concentration level standard for fluoride in bottled water, yet some scientists and environmental groups believe that the proposed limit is still too high and poses a danger to human health.

Photos reveal the recent rivers that ran across Mars

Mars may seem inhospitably dry now, but NASA's rovers have shown that water was once abundant on the Red Planet. Photos gathered during NASA's missions orbiting Mars have revealed that the planet was once home to raging rivers -- and that those rivers existed more recently than previously thought, according to a new study.