Our universe appears flat—but this observation still leaves plenty of options for its true shape. In fact, our cosmos could resemble a donut What shape is the universe? This question is far more ...

Amid a flurry of interest in newly declassified US government UFO files, a Chinese researcher has expressed intrigue in an apparent video of a fast-moving, human-shaped object. Zhang Nan, a ...

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Open-heart surgery can lead to long-term side effects such as postoperative cognitive dysfunction (POCD), which can affect people months after surgery, but usually improves within a year. Some people ...

Heart rate variability measures the variation in time between successive heartbeats, providing insights into the balance between the sympathetic and parasympathetic nervous systems, which influence ...

A K-shaped economy has held up better than expected—and it ain’t nuthin’ but a ‘G’ thang.