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Imagine a flywheel made from stacks of graphene sheets set at the magic angle
A flywheel is a rotating wheel, which stores the energy of motion. The energy is used to power something that needs power when it isn't moving - like an electric motor or fan.
A graphene sheet is a single layer of carbon atoms in an hexagonal lattice.
The magic angle is the angle at which graphene sheets stack to form a near-impenetrable barrier. Graphene has two possible stable stacking configurations, and one of them is the magic hexagonal arrangement.
The magic angle is 18°, which means that a graphene sheet must be rotated by 6° from the horizontal and then stacked on top of another to form an impenetrable barrier.
The graphene sheets can be made into a cylinder, in which case they would roll around the magic angle on top of each other to form an impenetrable barrier.
The graphene sheets can also be made into a disc and spun around, in which case they would roll around the magic angle on top of each other to form an impenetrable barrier.