Annus Mirabilis 4: E=mc²

121 years ago, on September 27th, 1905, the fourth and final Annus Mirabilis paper by Albert Einstein was published. In it Einstein presented a groundbreaking idea to the scientific world: energy (E) and mass (m) are interchangeable. They are both different manifestations of the same thing and can convert into each other.
This concept was quite revolutionary at that time.
Described in the world’s most famous equation: (E=mc²), it changed the way we view the Universe.

