Barack Obama's article in the top academic journal, Science, argues that the clean-energy revolution is irreversible and highlights the economic benefits of cutting carbon emissions and investing in renewable energy.
NASA’s Dawn spacecraft already racked up several firsts during its seven-year flight from Earth, and now it's the first-ever spacecraft to orbit a dwarf planet. Scientists are hoping its yearlong stay at Ceres, in the asteroid belt between Mars and Jupiter, will help reveal clues about how Earth got its water.
Time is running out for thousands of people in Africa who are in danger of contracting Ebola. A cure or vaccine will not come in time to prevent many more infections and possible deaths. And now a second case has been diagnosed in the US. Perhaps the only answer is a rapid diagnostic test that can quickly identify those who are ill and those who are not.