Frederick Bakewell demonstrated a working laboratory version in 1851.
Willoughby Smith discovered the photoconductivity of the element selenium in 1873.
Joshua Boyle and wife Caitlin Coleman were held hostage for five years by the Taliban.
And while their release ended one nightmare, their lives in Canada have come with daunting new challenges.
In the mid-1960s, color broadcasting was introduced in the US and most other developed countries.
The availability of multiple types of storage media such as Betamax, VHS tape, local disks, DVDs, flash drives, high-definition Blu-ray Discs, and digital video recorders have enabled viewers to watch prerecorded material—such as movies— at home on their own time schedule.
Although he never built a working model of the system, variations of Nipkow's spinning-disk "image rasterizer" became exceedingly common.