Once a client is presented with the HSTS policy, it caches the information for the specified max-age period. During that period, the browser refuses to access the web service over unencrypted HTTP, and refuses to grant exceptions to certificate errors (if the site previously presented a valid, trusted certificate).
A laser is a device that emits light through a process of optical amplification based on the stimulated emission of electromagnetic radiation. The term laser originated as an acronym for light amplification by stimulated emission of radiation.
As opposed to most types of cable, fiber-optic cable (also known as optical fiber) uses light instead of electricity to transmit signals. Obviously, light is the fastest method of transmitting information, but fiber-optic cable has the additional advantage of not being subject to electrical interference.