We see donation appeals everywhere these days - to help the people in Japan, to help the people in Darfur, to help the people in Haiti. What influences our decision to give? An interesting study comes from British psychologists, who analyzed how individuals respond to donation appeals in the wake of man-made disasters - like war - versus natural disasters. The authors around Hanna Zagefka from Royal Holloway University in London found that natural disasters elicit more donations than those caused by people. Their explanation: people tend to assign some blame to the victims of man-made disaster, while they blame no one for being overrun by a Tsunami.