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A thick haze has settled over Sydney, blown in from northwest of the city. Dean Lewins/AAP

What do Sydney and other cities have in common? Dust

The haze now engulfing Sydney isn’t an isolated problem. Cities around the world struggle to manage the many sources of tiny airborne particles and the discomfort and illnesses these cause.
A needle in a haystack? Search for the first ever biological molecule. Hubble Heritage/Flickr

Why is life left-handed? The answer is in the stars

Researchers have created a star-forming cloud in the laboratory to try to recreate the first-ever biological molecule. The study could explain why such molecules are left-handed.

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