Researchers demonstrated the first fully 3D-printed, droplet-emitting electrospray engine. The low-cost device can be fabricated more quickly than traditional thrusters, potentially from on board a ...

IDF strikes launcher * US signals backing for Israeli forces staying in 5 southern Lebanon posts after Feb. 18 * Hamas set to ...

When aviation pioneer Bertrand Piccard a decade ago spearheaded a much-hyped flight around the world in a plane powered by sunlight, it raised awareness about climate change but held little promise of ...