Kroto displays a model of his discovery in 1996: a soccer ball-shape carbon molecule that spawned a new field of study and could act as a tiny cage to transport other chemicals. Michael Scates/AP hide caption

itoggle caption Michael Scates/AP

Bull trout are running out of time in Montana as their traditional waters heat up, biologists say. By moving more than 100 fish to higher elevations, fisheries scientists hope to save the species by seeding a new population in waters that will stay cooler longer. Jim Mogen/USFWS hide caption

itoggle caption Jim Mogen/USFWS

Image of a mini-kidney formed in a dish from human induced pluripotent stem cells. Minoru Takasato/Nature hide caption

itoggle caption Minoru Takasato/Nature

In Boston, Edmund Hassan, a deputy superintendent of emergency medical services, and his colleagues regularly revive people who have overdosed on opioids. Jesse Costa/WBUR hide caption

itoggle caption Jesse Costa/WBUR

Students sort grapes at the University of California, Davis research winery. The winery is experimenting with various methods to conserve water. The hope is that commercial wineries will follow suit. Courtesy of Karen L Block/UC Davis hide caption

itoggle caption Courtesy of Karen L Block/UC Davis

The model of a DNA stands on a desk during a press conference to announce the winners of the Nobel Prize in Chemistry 2015 on Wednesday at the Royal Swedish Academy of Sciences in Stockholm. Sweden's Tomas Lindahl, Paul Modrich of the US and Turkish-American Aziz Sancar won the Nobel Chemistry Prize for work on how cells repair damaged DNA. Jonathan Nackstrand/AFP/Getty Images hide caption

itoggle caption Jonathan Nackstrand/AFP/Getty Images

The debate about sustainable diets has focused on meat production, which requires lots of land and water to grow grain to feed livestock. It also contributes to methane emissions. But the Cabinet secretaries with final authority say the 2015 dietary guidelines won't include sustainability goals. David McNew/Getty Images hide caption

itoggle caption David McNew/Getty Images

The "Super-Kamiokande" neutrino detector operated by the University of Tokyo's Institute for Cosmic Ray Research helped scientist Takaaki Kajita win a share of the Nobel Prize in Physics, along with Canadian Arthur B. McDonald. Kyodo /Landov hide caption

itoggle caption Kyodo /Landov