News

Humans

‘Bonding hormone’ linked to post-baby blues

Low oxytocin levels in pregnant women may help predict whether they will have postpartum depression.

Space

Crab Nebula activity keeps confounding

Unusually rapid fluctuations in the output of a supernova remnant send theorists scuttling for a reasonable explanation.

Chemistry

Idling jets pollute more than thought

Oily droplets emitted by planes operating at low power can turn into potentially toxic airborne particles.

Life

Animals quickly colonized freshwater

Fossilized worm burrows show that life had moved beyond the oceans by 530 million years ago.

Health & Medicine

Unnoticed celiac disease worth treating

People who have an antibody reaction to gluten but no outward symptoms are better off if they avoid grains containing the protein, a study shows.