During winter time, some snapping turtles like to hibernate in ponds and lakes. Safely tucked away underneath a thin layer of ice, these freshwater reptiles can survive up to six months without any oxygen to speak of.

How their bodies can cope with this depends on the way they were raised, it turns out. New research has revealed that when turtle embryos are exposed to low levels of oxygen, it programs their hearts to be more resilient to such conditions for the rest of their lives.

From the very start of their existence, it appears these incredible creatures are primed for a life of aquatic hypoxia. Developing in nests deep beneath the water, their embryos can sometimes be subject to as little as 11 percent oxygen, and this can permanently alter their cardiac structure and function.

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A unique find of two boat burials from the Viking Age have been discovered in Sweden. One of the two graves was intact with remains of a man, a horse and a dog.

The two boat burials were found during an excavation at the vicarage in Gamla Uppsala last autumn. A medieval cellar and a well were excavated and then one of the boats was observed beneath the more modern structures. The two boat burials have been excavated during the last month and the results are sensational. “This is a unique excavation, the last burial ship here was excavated 50 years ago,” says archaeologist Anton Seiler.

A ship burial was a specific funeral practice in which the dead person was placed in a ship or boat often along with rich gifts like jewellery or sets of weapons and other objects. This kind of grave typically dates back to the Vendel Period (around 550–800 AD) or the Viking Age (800‑1050 AD), when it otherwise was common to cremate the dead. The graves can therefore be very well preserved. This custom was probably reserved for people of a higher social standing in society.

Wildlife: ⬇️ Biodiversity: ⬇️ Human population: ⬆️.

Miguel Claro is a professional photographer, author and science communicator based in Lisbon, Portugal, who creates spectacular images of the night sky. As a European Southern Observatory photo ambassador, a member of The World At Night and the official astrophotographer of the Dark Sky Alqueva Reserve, he specializes in astronomical “skyscapes” that connect Earth and the night sky. Join him here as he takes us through his photograph “Light Trails in Israel Desert.”

Star trails circle over Ramon Crater in this long-exposure photo of the night sky over Israel’s Negev Desert.

I captured this photo from inside Ramon Crater (also known as Makhtesh Ramon), the world’s largest erosion cirque. The Ramon Crater geological formation has nothing to do with a meteor strike, despite its name. Rather, this “crater” formed about 220 million years ago when the ocean that once covered the area dried up. The eroding ocean floor then gave way to the crater-like valley we see there today.

Insects are disappearing at an incredibly fast rate!

A broad-spectrum look at the future of phages.

When Jeff Bezos and his first Amazon staff began selling books from his garage, they started an enterprise that is now the largest online retailer in much of the world. As Amazon celebrates its 25th birthday, it’s the world’s most valuable public company and Bezos is the richest person on the planet.

Coming into effect as early as 2021.