WHEN there are some strangers in front of us, which of them will we trust? According to a new study in the online PloS One (<<*>> ), people make their decisions to trust others largely based on their faces. Your appearance can do a lot for you, especially if you are in the financial industry. The more trustworthy you look, the more likely people will buy what you're selling. Researchers from Britain's University of Warwick Business School, University College London, and Dartmouth College, US, did a number of experiments. The research team used computer software to make 40 faces, from the least to the most trustworthy-looking. The study said that the difference between a trustworthy face and one that isn't as trustworthy comes from features that look slightly angry or slightly happy, even when the face is at rest. However, a slightly happy face is more likely to be trusted. Researchers gave participants some money and asked them which face they trusted to invest the money for them. Then researchers gave some good and bad information about the people with these faces, and asked the participants again whom they trusted. The results showed that even if they got different information, the participants didn't change their choices. They were still more likely to invest their money with the more trustworthy-looking faces. Chris Olivola, one of the study's authors, said in the University of Warwick's press release: "It seems we are still willing to go with our own instincts   about whether we think someone looks like we can trust them. The temptation   to judge strangers by their faces is hard to resist." Which of the following can be a proper title for this passage?
What kind of face do you trust? Who did the experiments? Why do you trust him or her? Why did they do the experiments?