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Simplest self-braking pulley
This experiment shows how a basic pulley system can be designed to brake itself, demonstrating clever mechanics with minimal components.
Discover 5 proven exercises to fix a flat chest and build upper pecs with incline variations and tempo tweaks.
Life's biggest questions, explored.
Live scores for every 2025 ATP and WTA tennis tournament on ESPN. Includes daily schedules, live scores and match results from every tour event.
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