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It is a radical form of recycling. Calendars from 1996 are being reused for 2024 as both are leap years that begin on a Monday. The quirk has sparked a flurry of interest on the internet, with 1990s nostalgia fans chasing down vintage calendars nearly 30 years old. As last year came to an end, people began posting about how the 1996 calendar works neatly in 2024, with one TikTok clip garnering over 1.5 million views. Another viral post, this time on X (formerly Twitter), playfully reminds people to start reusing their…

Billings: This is Cosmos, Quickly. I am Lee Billings.  Gravitational waves--ripples in the fabric of space time first predicted by Einstein more than a century ago are one of astronomy's hottest topics ever since their first direct detection in 2015. Most gravitational waves in astronomers catalogs have come from pairs of colliding middleweight black holes. Other sources should exist, however, chief among them mergers of supermassive black holes weighing millions to billions of suns. But these giant collisions make…