Two party leaders have to cooperate in a coalition government, despite their political differences. A referee and a linesman have to make a decision that could spell success or failure in an international sporting tournament. Two heads have to direct the same groovy body towards saving the galaxy. From politics to sport to interstellar hitchhiking, there are many situations that require two people to work together.

Now, Bahador Bahrami from the Interacting Minds Project has found evidence that two proverbial heads can indeed be better than one… but only under certain circumstances. Through a simple experiment where volunteers cooperated to find a hidden image in a screen, Bahrami found that pairs trump individuals if they freely