This is an older piece, but given that we're into hurricane season, I expect it will come up again. How do you tell if the photo you've been forwarded, showing sharks swimming through flooded urban landscapes, is real or fake? Marine biologist (and shark expert) David Shiffman has a simple 5-step process. In fact, it's so simple that I'm sure many of you will already be familiar with these tricks. But, here's the thing, it's helpful to be reminded that the tricks are necessary. They're very easy to forget when a hurricane is crashing into shore and social media is blowing up. Besides which, this will make a handy link to forward to friends and family passing questionable photos of all sorts.