A compact optical frequency division system with magnesium-fluoride-microresonator-based frequency references and silicon-nitride-microresonator-based comb generators is reported, offering a soliton pulse train at 25-GHz microwaves with an absolute phase noise of −141 dBc Hz–1 and timing noise below 546 zs Hz–1/2 at a 10-kHz offset frequency.
Diverse perspectives, especially those from Indigenous knowledge systems, can enhance our ability to respond to environmental changes. Integrating alternative time-keeping methods into mainstream practices could foster fairer and more effective solutions to environmental problems.
Seasons are more than just divisions of time — they connect us with nature. Finding synchrony with changing seasonal rhythms is essential for building a sustainable future.
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In 2015, astronomer Tabetha Boyajian and colleagues announced the discovery of unusual light fluctuations coming from a star about 1,500 light-years away. It came to be known as “Tabby’s star” or “Boyajian’s star,” and the peculiar alterations in the light transmitted to Earth quickly drew attention.
