In AM (amplitude modulation) radio, a wave with constant strength ... The modulating signal then comes from the bacteria's 24-hour circadian clock, which acts as an internal time-keeping mechanism.

Found in the hotel is endless clock paraphernalia, from clock pillows in guests’ suites to round mirrors that resemble clocks ...

Another casualty of the smart phone revolution is the humble bedside alarm clock as its radio, alarm, and timekeeping functionalities are also provided by modern devices. [zst123] has a ...