Carbon nanofiber

There is more information available on this subject at Carbon nanofiber on the English Wikipedia.

Carbon nanofiber is an extremely strong material consisting of cylindric nanoscale structures of graphene layers arranged as cones, cups or plates. Carbon nanofibers with graphene layers wrapped into cylinders are called carbon nanotubes.

Due to its great strength, humans use carbon nanofiber in various structures which require extreme durability, including the strands for space elevators, used for lifting objects between a planetary surface and outer space.