Nanometre (Nanometer)

X-rays have a wavelength ranging from the size of 0.01 nm to 10 nm.

Three gold atoms lined up are about one nanometer (nm) long.

Human fingernails grow at approximately one nanometer per second.

Nanosecond

One nanosecond (ns) is about the time required for light to travel 30 cm in air, or 20 cm in an optical fiber.