Super-thin almost invisible graphene condom. After ten years on the market, it's noticed that it causes cancer in users and in nature after disposal...
Graphene superconductors are compost-able.... we will know more in time, but as a sheet of pure carbon graphene has an intuitively low risk of being carcinogenic. Graphene is also produced every time you write with a traditional pencil, so tons of graphene exposure starting at a very early age has occurred, with no known side affects.
