dust

The rock and dust samples - the first to be retrieved from the far side of the Moon - were collected by the Chang’e-6 spacecraft, following a nearly two-month long mission which was fraught with risks.

The concentration of fine dust particles in the air fell in all of the investigated regions after 2006.

Mountains in San Bernardino and Riverside counties are expected to see a dusting of snow Friday night, with accumulation of up to two inches for communities above 5,000 feet of elevation.

At benches they brush and gently scrape dust from fossilized bone, with the gentle dexterity of dentists cleaning Jurassic-era teeth.

Authorities in Delhi - which has an estimated population of more than 33 million - have already enacted measures aimed at tackling the pollution, including spraying roads with water containing dust suppressants.