Nearly 4,000 years ago, a disgruntled trader named Nanni fired off a litany of woes about a transaction gone awry, giving a piece of his mind to an allegedly unreliable merchant—a fellow Babylonian by the name of Ea-nāṣir. This palm-sized clay tablet, inscribed in cuneiform, rails against the delivery of poor-quality copper. Considered the “world’s oldest complaint letter,” it was found in the house of metal merchant, Ea-nāṣir. Head to the link in bio to learn about who Ea-nāṣir was, and why Nanni’s complaint letter is so compelling thousands of years after it was written. Photograph courtesy of the Trustees of the British Museum

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From the icy landscapes of Antarctica to the tropical shores of the Galápagos, penguins are masters of adaptation—now you can uncover their extraordinary secrets with @bertiegregory. #SecretsOfThePenguins premieres April 20 on @natgeotv, streaming next day on @DisneyPlus and @hulu. #ourHOME

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It's been amazing seeing all your photos and videos celebrating the planet so far! 📸 Join our Earth Month challenge through April 22nd by using #NatGeoYourShotOurHOME. National Geographic photographer and wildlife filmmaker @BertieGregory will curate this special challenge, so stay tuned!

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Beautiful. Breathtaking. Home. 🌍 Celebrate Earth Month with the premiere of #SecretsOfThePenguins on Sunday April 20, and stream the rest of the #ourHOME collection all month long on @DisneyPlus.

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Photo by @davidliittschwager | The creatures of the mesopelagic layer, or “twilight zone,” are vital to our oceans. At depths of between 660 and 3,300 feet, this horizontal region is home to a mind-boggling array of species like this tadpole snailfish (seen in a lab). From a point where photosynthesis fails to where the last remnants of sunlight taper out, animals have evolved unique strategies to survive in the darkness. Learn more about them at the link in bio.

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From an eye-catching planetary alignment to a "pink moon" and a rare chance to see Mercury, there are plenty of celestial events to look forward to this April. Whether you’re an amateur astronomer or a seasoned stargazer, you won’t want to miss any of them. Head to the link in bio to find out when and where to see these iconic night sky events. Photographs by Bjoern Kils and Irakli Gedenidze, Reuters/Redux

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Euclid, a European space telescope designed to create a three-dimensional map of the universe, has recently released its first major findings—featuring 26 million galaxies and a treasure trove of data. It’s expected that Euclid will go on to find billions more galaxies as it continues its six-year mission to study deep space, ultimately creating an interstellar chart that could help scientists answer some of their biggest questions about dark matter and dark energy. Learn more about this remarkable new data and its applications at the link in bio. Photographs by ESA/Euclid/Euclid Consortium/NASA

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Photo by @joelsartore | Despite having a distinctive voice, African palm civets prefer to use scent rather than sound to communicate. Equipped with multiple scent glands, these civets will use a brown musk secreted from the primary gland on their abdomen to scent mark various objects in order to communicate with other civets. According to researchers, additional glands on the bottom of the chin and feet produce a floral or fruity scent. Photo taken in Libreville, Gabon. To see more species featured in the Photo Ark, follow me @joelsartore. #PhotoArk

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African wild dog packs share responsibility for raising pups. As incredibly social animals, the bonds they forge in their early days are integral to the cooperation their packs display when they're grown. #GrowingUpAnimal is now streaming on @DisneyPlus.

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