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Always Smile... or not
The Always Smile function lets you scroll through the series of images captured in a Zoe to try to get the best face on the person in the image. You can also use it for goofy faces.
Still captured from a Zoe
A slick feature on the HTC One is the 3-second Zoe capture. With this function you can then capture and save the still image from the 20 frames that are captured. Here is a cool photo showing red, white, and blue in my fireworks.