Scientists Fear Shellfish Could Be Wiped out as Arctic Ocean Acidifies
Ocean expected to absorb more carbon dioxide than expected in next 80 years.
Ocean expected to absorb more carbon dioxide than expected in next 80 years.
Christina Koch, veteran of six spacewalks outside the International Space Station -- including the first all-female excursion -- joined a Russian commander and an Italian flight engineer for a fiery plunge to a landing in frigid Kazakhstan early Thursday, setting a record for the longest single flight by a female.