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Alarm clock. An alarm clock or alarm is a clock that is designed to alert an individual or group of people at a specified time. The primary function of these clocks is to awaken people from their night's sleep or short naps; they can sometimes be used for other reminders as well. Most alarm clocks make sounds; some make light or vibration.
The Shortt–Synchronome clock, an electrical driven pendulum clock designed in 1921, was the first clock to be a more accurate timekeeper than the Earth itself. [167] A succession of innovations and discoveries led to the invention of the modern quartz timer. The vacuum tube oscillator was invented in 1912. [168]
On September 14, 2015, 14-year-old Ahmed Mohamed was arrested at MacArthur High School in Irving, Texas, for bringing a disassembled digital clock to school. The incident ignited allegations of racial profiling and Islamophobia from many media sources and commentators. The episode arose when Mohamed reassembled the parts of a digital clock in ...
An alarm clock with no sound makes waking up easier without the stress. “An alarm clock can be disruptive if you’ve had an unrestful night,” says Frida Rångtel, PhD, sleep educator and ...
If you normally use your phone as an alarm clock, there's a simple solution: Get a traditional alarm clock. We’ll help. We've amassed the top 12 best alarm clocks, from simple no-frills models ...
A talking clock (also called a speaking clock and an auditory clock) is a timekeeping device that presents the time as sounds. It may present the time solely as sounds, such as a phone-based time service (see " Speaking clock ") or a clock for the visually impaired, or may have a sound feature in addition to an analog or digital face.
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