WHO: Robert Kurzban, assistant professor of psychology in the University of Pennsylvania's School of Arts and Sciences

WHAT: The Penn Science Cafe lecture series, free and open to the public, takes science out of the laboratory and treats it to a night on the town.  The Penn Science Cafe can be your chance to ask leading experts your questions about science.

WHERE: The MarBar, 40th and Walnut streets, Philadelphia

WHEN: Tuesday, March 20, 6 p.m.

Doors open at 5:30 p.m.

    Menu items available for purchase

This month at the Penn Science Cafe, Dr. Robert Kurzban will discuss mate copying.

Birds do it.  Fish do it.  Do people do it?  And what is it, anyway?  It's why some women fall for only married men, why a wedding band transforms some men into "chick magnets" and why a lot of women find guys with cute girlfriends more attractive.