It's the laziest form of activism: Slacktivism. And if you're not a slacktivist yourself, you definitely know one. We're talking about that person who talks about going out and helping people in need, but never quite gets around to it.
What motivates people to help others? Could altruistic behavior be influenced by genes?
This Week in Discovery News we guess if Jesus was a happy fellow, ruminate over the mass deaths of our porpoise friends and shatter theories surrounding the Moon's heraldry.