SpaceX shifts focus from Mars to moon, Musk says

SpaceX is putting its longstanding focus of sending humans to Mars on the back burner to prioritize establishing a settlement on the moon, founder Elon Musk said Sunday.

Reviving antibiotics with two-faced nanoparticles

Over the decades, many strains of disease-causing bacteria have evolved defenses to even the most potent antibiotics, setting off a growing health crisis. The rise of antibiotic-resistant "superbugs" has also set off an arms ...

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