History Photographed on Instagram: "This is the phenomenon of astronauts temporarily having difficulty readjusting to Earth's gravity after spending time in space.⁠ ⁠ This condition, which is called orthostatic intolerance, is a condition where the bodies struggle to adjust to Earth’s gravity in an upright position. ⁠ ⁠ In space, their bodies adapt to microgravity, which weakens leg muscles and causes cardiovascular changes. ⁠ ⁠ Back on Earth, standing up can lead to a sudden drop in blood press

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Explaining The Universe on Instagram: "Follow (us) @ExplainingTheUniverse to learn something NEW every day 🧠💫 The Dead Sea is a unique salt lake located at the border of Jordan and Israel, famous for being one of the saltiest bodies of water on Earth. It sits in the Jordan Rift Valley, more than 400 meters (1,300 feet) below sea level, making it the lowest exposed point on land. Its salinity is about 10 times higher than typical ocean water, which makes it impossible for most organisms to surv