A nurse adjusts the position of a patient's arm during dialysis treatment. The treatment requires trained staff that weren't readily available in the aftermath of Hurricane Sandy. Michael Donne/Science Source hide caption

itoggle caption Michael Donne/Science Source

Photographer David Blackwell and his wife prepared for the apocalypse. Cats and cat food? Check. Toilet paper? Check. Exploding volcanoes and hurtling asteroids? Not so much. David Blackwell/Flickr hide caption

itoggle caption David Blackwell/Flickr