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In 1927, Werner Heisenberg, a German physicist, presented what is claled the Heisenberg Uncertainty Principle which dealt with quantum mechanics.

The Principle, as outlined by the BBC:

“Light can be considered as being made up of packets of energy called photons. To measure the position and velocity of any particle, you would first shine a light on it, then detect the reflection. On a macroscopic scale, the effect of photons on an object is insignificant. Unfortunately, on subatomic scales, the photons that hit the subatomic particle will cause it to move significantly, so although the position has been measured accurately, the velocity of the particle will have been altered. By learning the position, you have rendered any information you previously had on the velocity useless. In other words, the observer affects the observed.”

The Uncertainty Principle, which simply states that it’s not possible to know the position and velocity of one object at the same time, was the precursor to what is now known as the quantum theory and this video carefully examines what it is all about.

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