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Runners should GRADUALLY introduce shoe technology into training. New survey data shows 61.7% of amateur runners using "super shoes" perceived changes in technique, That has downstream negative effect on injury risk and soreness. Here is a breakdown (including a progression for implementation)

71,663 次观看 • 2 年前 •via X (Twitter)

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🚨 EARTH IS SPINNING SLIGHTLY FASTER AND FOR THE FIRST TIME, SCIENTISTS ARE SERIOUSLY DISCUSSING A “NEGATIVE LEAP SECOND”. For decades, Earth’s rotation has been gradually slowing, which is why we occasionally add a leap second to keep atomic clocks in sync with the planet. But since around 2018–2020, something unusual has happened: Earth has been rotating faster than expected. Several days in recent years (including June 29, 2022) were among the shortest ever recorded by atomic clocks. This acceleration has forced timekeepers to consider something that has never been done before: subtracting a second from official time (a negative leap second) instead of adding one. Why this matters: • A negative leap second would mean clocks skip a second (e.g., jumping from 23:59:58 straight to 00:00:00) • It would be the first time in history this has happened • It could affect GPS, financial systems, telecommunications, and any infrastructure that relies on precise timing • The leading theory links the speedup to changes in Earth’s liquid outer core, though melting ice sheets are partially counteracting the effect The deeper implication: Earth is not a perfect clock. Its rotation speed is influenced by complex interactions between the core, oceans, atmosphere, and even climate change. As we become more dependent on ultra-precise global timing, these small geophysical changes are no longer just scientific curiosities they’re potential infrastructure issues. A 2024 study in Nature suggested a negative leap second might be needed around 2029, though the exact timing remains uncertain and depends on how Earth’s rotation behaves in the coming years. Would you rather we keep adding/subtracting leap seconds forever, or should we eventually decouple our clocks from Earth’s imperfect rotation? Follow for more frontier Earth science and timekeeping realities.

TheNewPhysics

48,968 次观看 • 22 天前

The idea that lifting weights will stunt a child’s growth is actually a myth that for some reason started and spread after a mid 1900s Chinese study to find out why child laborers on a mine in a remote region of China were on average signifigently shorter than their peers. The hypothesis was that it was due to carrying heavy loads out of the mines. However, the technology at the time could not confirm that as the cause, and the study was deemed inconclusive because they couldn’t tell if the cause was in fact the loads or if it was due to malnourishment due to the remote area in China, and all the time spent in the mines. Fast forward to 1999, Dr Avery Faigenbaum relooked at the issue this time studying a group of pre-pubescent children participating in resistance training vs a control group (Faigenbaum et al. 1999). Using modern technology )I believe he used MRIs) he found that the bone density was actually thicker in the trained group vs the control group, with no damage or negative impact on growth plates. Several hundred follow up studies have been done in the close to 25 years since and have all confirmed Faigenbaum’s findings. Resistance training (which includes weight training) causes bone density increases with no risk to growth plates. As such, even the American Association of Pediatrics as well as many other orgs such as National Strength & Conditioning Association and National Academy of Sports Medicine all encourage youth resistance training under qualified supervision. Links to a few recent scientific papers & position statements supporting the benefits to resistance training for youth (and debunking the stunting growth myth) This on shows the cognitive benefits caused by resistance training in youth athletes :

Chris Romano M.A.

19,823 次观看 • 2 年前