If an animal behaviorist saw your text messages, they'd probably classify them as contact calls. Like a chicken's cluck or a goose's honk, we use iMessage to share our immediate thoughts, make short-term plans, or just say hi to friends and family.
Eidetic imagery is the closest scientifically-recognized concept to photographic memory. Some people—scientists call them "eidetikers"—are able to look at an image and take a mental picture of it. When the picture is removed, they report still being able to "see" it, colors and all.
iPhone lovers and productivity fans have dozens of new features to celebrate with the September 2016 release of iOS 10. Most of these ways to express yourself, save time, or outsmart the masses are brand-new—though we've mixed in a few indispensable classics.