Frequency! It’s an important thing to measure, which is why [Jacques Pelletier] built a frequency counter some time ago. The four-function unit is humble, capable, and also an entry into our 2025 One ...

For much of the history of the wristwatch, mechanical movements were perfectly content to tick along at 2.5 or 3 Hz, measuring time at a leisurely 18,000 or 21,600 vibrations per hour, respectively.

Scientists have unveiled a new approach to detecting gravitational waves in the milli-Hertz frequency range, providing access to astrophysical and cosmological phenomena that are not detectable with ...