Sleep happens in cycles that include three non-rapid eye movement (NREM) stages and one rapid eye movement (REM) stage, repeated 4 to 5 times nightly. Each cycle typically lasts 90 to 110 minutes. The ...
At 830 feet below the waves off the Argentinian coast, deep-sea explorers caught a glimpse of a rare, giant phantom jellyfish drifting silently through the water. Eerie yet fascinating footage shows ...
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