Alexander Todorov is a professor of psychology at Princeton University.

His research on how we're influenced by people's faces is world-leading, and he says it happens quicker than you think.

He says that he expected in a study that it would take people a substantial amount of time to make complex judgments about people, like as to whether they seem trustworthy or aggressive:

now we know that essentially you don't need more than a 200 millisecond exposure to a facial image. So literally these are single-glance impressions.

It turns out it's only a fraction of a second that you have to make a good first impression.

Here's how you make that time work for you:

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