Lead Stories
Start-ups are working to clear space debris
With space junk keeping pace with the number of satellites in orbit, some start-ups are cleaning up to keep debris from falling to Earth.
The cosmic rush
A series of new space missions is expected to answer some of the deepest questions in cosmology.
Safety on tap
From LED lamps to awareness courses, a slew of measures seeks to make drinking water safe.
Let there be water
The world faces a water crisis. But researchers are tapping advanced science to avert it.
Technologies to cool the world
Scientists are working on technologies to bring down temperatures — of places and people — sustainably.
