Portugal may be taking a key step in the race for stealth technology with a graphene-based radar-absorbing material that could make drones and warplanes almost undetectable.

Portugal may be taking a key step in the race for stealth technology with a graphene-based radar-absorbing material that could make drones and warplanes almost undetectable.

Portugal may be taking a decisive step in the global race for stealth, with a graphene-based radar-absorbing material that could render drones and warplanes almost undetectable.