http://physicsbuzz.physicscentral.co...invisible.html

According to the Nobel Academy document, if a one square meter hammock made of graphene were "tied between two trees you could place a weight of approximately 4 [kilograms] before it would break. It should thus be possible to make an almost invisible hammock out of graphene that could hold a cat without breaking. The hammock would weigh less than one [milligram], corresponding to the weight of one of the cat's whiskers." (Pardon me if this went over the heads of our less savvy readers.)
First cats...then campers.