Engineers Found Evidence of Hydraulics in an Ancient Pyramid, Solving a 4,500-Year-Old Mystery

In a preprint paper, scientists concluded that the Step Pyramid of Djoser in Saqqara, Egypt—believed to be the oldest of the ...
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How to Read Your Blood Pressure Numbers Correctly

Your systolic blood pressure and diastolic blood pressure describe the pressure on your arteries at different points in your heart beat.