Question

Atomic clocks utilize the metal cesium to keep time. Cesium is a highly reactive metal that is also used in television cameras and photoelectric cells, as well as in atomic clocks. The best of these timepieces are incredibly accurate, to within one second in fifty million years.

Summarize the passage in one sentence

Try to have an overview of the key words in your mind
Omit the examples of what cesium is also used for, as well as the part in parenthesis

Answer 1

Atomic clocks use the reactive metal cesium to maintain exceptional accuracy in timekeeping.