Jonah Rosner | Elite Running Scientist on Instagram: "Most runners are told to stretch their calves and Achilles to run better. The problem is that efficiency does not really come from flexibility. It comes from stiffness. Your calf muscle and Achilles tendon work together as one unit. When the Achilles is stiffer, it takes on more of that stretch. That allows the calf muscle fibers to work more isometrically (this is just a nerdy term we use to mean the muscle does not move much, but it makes u

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@zonofun on Instagram: "The video demonstrates a toy car model in a simulated rain setup, showing how increasing speed from 0 to 260 mph creates airflow that deflects water droplets over the open-top vehicle, keeping the interior dry, illustrating relative velocity and aerodynamics. - This effect stems from boundary layer airflow over the car, governed by the Reynolds number in fluid dynamics; studies like those in the Journal of Fluid Mechanics confirm faster speeds reduce rain penetration into