How do you test an Ebola vaccine?
Scientists in West Africa are racing to determine what immunization strategies could be most effective to contain the epidemic.
Earth’s deep crust could support widespread life
Discovery of hydrogen-rich waters hints at unexplored microbial ecosystems.
Curiosity rover sniffs Martian methane
Background gas levels are low — but they spike periodically.
Titan’s giant dunes track ancient climate
Long-term orbital wobbles drive changes in sand patterns on Saturnian moon.
Physics: Quantum computer quest
After a 30-year struggle to harness quantum weirdness for computing, physicists finally have their goal in reach.
Homo erectus made world’s oldest doodle 500,000 years ago
Shell markings are the oldest abstract signs ever discovered.
Photons double up to make the invisible visible
People have infrared vision — and it could be the result of pairs of photons combining their energies to appear as one ‘visible’ photon.
Immune system offers clues to cancer treatment
Molecular signatures hint at who will benefit from next-generation cancer drugs.
Nuclear power: Desperately seeking plutonium
NASA has 35 kilograms of plutonium-238 to power its deep-space missions — but that will not get it very far.
Barley fuelled farmers’ spread onto Tibetan plateau
Cold-tolerant crop enabled high-altitude agriculture some 3,600 years ago.