Physics 101 - All objects will fall to the ground at the same time.

In physics, we learnt that all objects would fall to the ground at the same time.  However, we realized that it was impossible in the real world.  Scientists had proven the laws of physics in a controlled environment whereby there's no air resistance to affect the falling objects.

When there's no air resistance, objects really fall to the ground at the same time regardless of weight and shape because the same gravity is acting on the objects.