Today's Globe: good old memories, geobiology, FDA review, peanut butter recall

In Health/Science:

As we get older, research suggests, the brain manages to dismiss negative memories but retain the positive ones.

Geobiology is, in part, about looking for life or life's graffito - and finding it - in unusual places: deep in ancient rock, in super-heated waters of undersea volcanic vents, and beneath the ice of Greenland.

How can you be sure that microwaved frozen chicken is safe to eat?

What's the science behind opals?

Also, mosquitoes have their own wing tones and infant spinal taps may be overused (second item).

Also in today's Globe:

Missing information, loopholes, and weak oversight hamper efforts to uncover financial conflicts by researchers who test experimental drugs before companies seek government approval, an internal watchdog finds in a report about the Food and Drug Administration.

An Ohio distributor says it has recalled two brands of its peanut butter distributed only through food service providers and not sold directly to consumers after an open container tested positive for salmonella bacteria.