This slams down on the central core, collapsing from several hundred kilometers across down to a couple of dozen kilometers across in just a few thousandths of a second!
Every child that is born into his group will share them with him, and no child born into one on the opposite side of the globe can ever achieve the thousandth part.
When you flip on a light inside of your room, the light probably moves fast enough to reach across the entire room in just one 500 thousandths of a second which to mere human eyes basically feels instant.
While other scopes at the time were lucky to get 50-times magnification, Van Leeuwenhoek's had up to 270-times magnifying power, identifying things as small as one thousandth of a millimeter.