Three 'Modern' Inventions That Existed Millions Of Years Ago

Evidence exists pointing to prehistoric civilizations as advanced as our modern civilization - or perhaps more advanced. Such evidence could turn our scientific certainties upside down.
The discoveries that nuclear reactors, telescopes and clothes existed millions of years ago have been contested, but some scientists have maintained that they constitute indisputable evidence that at that time humans walked the earth with as much knowledge and culture as today's people.