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Biomechanics of the knee joint: flexion and extension
Flexion and extension of the knee refer to the movements of the leg at the knee joint. Flexion of the knee occurs when a person bends the leg, bringing the heel closer to the back of the thigh. It reduces the angle between the femur and tibia. Extension of the knee happens when a person straightens the leg, moving the heel away from the thigh ...
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Mount Semeru in East Java erupted again on Monday (April 20, 2026) at 16:25 WIB. In the past week, Mount Semeru has erupted twice. Quoting eruption information from the Center for Volcanology and Geological Hazard Mitigation (PVMBG) via the MAGMA Indonesia application, the observed ash column height reached 600 meters above the peak (4,276 meters above sea level). The ash column was observed to be gray in color with thick intensity towards the north. The eruption was recorded on the seismograph
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