“The world is the great gymnasium where we come to make ourselves strong.” -Swami Vivekananda
But what does it truly mean to be strong? We have four fundamental forces in the Universe: the strong, electromagnetic, weak and gravitational forces. You might think that, by virtue of its name, the strong force is the strongest one. And you’d be right, from a particular point of view: at the smallest distance scales, 10^-16 meters and below, no other force can overpower it.
But under the right circumstances, each of the forces can shine. Up until recently, on the largest scales, we thought that gravitation — by and large the weakest of the forces — was the only force that mattered. And yet, when we look on the very largest scales, many billions of light years in size, even gravitation doesn’t win the day.