* Bees can recognize human faces, study finds:
Honeybees may look all alike to us. But we don't
necessarily look all alike to them.
* Beethoven's wish fulfilled:
Researchers say they have fulfilled Beethoven's wish
that his remains be used to learn what caused his
fatal illness. Their answer: lead.
* How the 'trust hormone' works:
A brain chemical that boosts trust seems to work by
damping connections in brain circuits that process
fear, a study suggests.