Amber Dance

Studies claiming to reveal strategies for feeling happy get a second look.

As cells divide, they must copy all of their chromosomes once and only once, or chaos would ensue. How do they do it? Key controls happen well before replication even starts.

Boys are four times as likely as girls to develop autism. Girls are nearly twice as likely to experience depression. The immune system may be a player in these and other brain-health disparities.

Neuroscientists think a cluster of cells in the brain that stimulate appetite could be a target for eating disorder therapies.

Amyloid plaque can build up in body organs other than the brain. The resulting diseases — AL amyloidosis, ATTR amyloidosis and more — cause much suffering.

Viruses, it turns out, can block one another and take turns to dominate.

More work is needed before declaring the technique a fountain of youth.