No, not directly.
There are processes where nickel is used in recovering silver from used developer. Also, some developer tanks are stainless steel (typically, steel with about 18% chromium), which are usually made of a higher grade of stainless steel that also contains about 8% nickel. Other than these remote possibilities, I know of no other use for nickel in the photographic process.
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Suggestive photos are typically photos that have adult content in them. These type of photos are not suitable for a child's eyes.
It's used to make black and white photos. http://en.wikipedia.org/wiki/Calotype
No. You can back up your apps, and transfer your photos with iTunes with a USB connection. Apps can only be used on your iPad.
Oblique Aerial photos are photos taken from an aerial platform where the camera has more than 3 degrees of tilt. "Ground level" photos can either refer to aerial photos taken where the lens is level with the ground or to photos taken where the camera is placed within a few inches of the ground and photo are taken from that perspective.
It might be because of the film processing or printing of photos.