Why does Greta look so happy in this photo?
Perhaps it's because she's wearing her new neurotransmitter earrings, chosen by CogDaily readers (for the results of our poll, see this post).
Seratonin and dopamine were in a dead heat, so she got one of each. A close-up of the earrings is below the fold.
Awesome! Were these ordered from some cool company, or made by a metalworking friend?
Never mind, all became clear when I followed the links.