How does "High Dynamic Range" Photos work?

I see that I'm getting two photos from each shot. I suppose that's because I tabbed "on" the selection to keep the regular photo.
What's going on with "High Dynamic Range" photos and how can I tell which photo is the regular photo and which is the HDR Photo?
Also, is that something new with iOS 8?

You're welcome. Here's the HDR from the IOS 7 User Guide.
“HDR
HDR (high dynamic range) helps you get great shots, even in high-contrast situations. The best parts of three quick shots, taken at different exposures (long, normal, and short), are blended together into a single photo.
Use HDR. (iSight camera on iPad 3rd generation or later) Tap HDR. For best results, keep both iPad and the subject still.
Keep the normal photo in addition to the HDR version. Go to Settings > Photos and Camera.
HDR versions of photos in your Camera Roll are marked with “HDR” in the corner.”
Excerpt From: Apple Inc. “iPad User Guide For iOS 7.” Apple Inc., 2014. iBooks.
This material may be protected by copyright.
Check out this book on the iBooks Store: https://itun.es/us/fJctQ.l

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High Dynamic Range Photos

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Attachments:
producer consumer mode.png ‏28 KB

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How does "High Dynamic Range" Photos work?

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