This shouldn't come as a surprise to anyone who understands cameras and megapixels and storage space, but it could be a good excuse to not get suckered by the megapixel wars in buying a camera. The more pixels, the more space it takes. A thousand images taken on the 36-megapixel Nikon D800 takes up 47GB. A thousand images on the reasonable 12MP Nikon D3s? Only 15GB.
Duh. Three times the megapixels, three times the storage space. But do we really need all those pixels? If you're taking holiday pictures that just get stored on your laptop? Probably not. If you bought a DSLR because you have a kid now and that's what people with kids do? Probably not. If you thought buying an expensive camera because you want better Instagram pictures? Probably not. You're paying needless money on something that takes up needless space!
So be wary the next time you get suckered into the peenwhipping measurement of megapixels, you're gonna have to pay for it in storage.