Saying "Merry X-mas" like a Mathematician


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Tai Chi Chuan—Directional Instructions

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If you plan to learn Tai-Chi by watching video  without teacher's help, one of the difficult parts is to learn in which direction you should face in the exercise. In this article, I will try to help by providing directional guidance. Clock-Facing Position Whatever position you take at the start of the form (or whatever direction the center of your chest and navel face) consider that starting position to be facing the 12 o'clock position . [2] When the center of your chest and navel face the 12 o'clock position, your right side faces 3 o'clock , your back side faces 6 o'clock , and your left side faces 9 o'clock . Movements In  Yang-Style Tai Chi Chuan , it is composed of 24 forms. Starting at the starting position facing 12 o'clock, you move from right to left and then left to right on approximately a line as shown in the diagram. When you finish, your final position will face 12 o'clock again. From below, please f...
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Yang-Style Tai Chi Chuan 24 Forms

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Attention: Click  here  to view a mobile-friendly version. Health Benefits Tai Chi is often described as “ meditation in motion ,” but it might well be called “ medication in motion .” As you move, you breathe deeply and naturally, focusing your attention — as in some kinds of meditation — on your bodily sensations.  You can read [16] to learn its health benefits. Video 1.   24 Tai Chi video with English subtitles and narrations (YouTube link ) Movements In Yang-Style Tai Chi Chuan , it is composed of 24 forms. Starting at the starting position facing front, you move from right to left and then left to right on approximately a line as shown in the diagram (see [ 12 ] to learn in which direction you should face with each form). When you finish, your final position is about one step to the left of your starting position. So, if you have a free space of roughly 20 feet x 6 feet, you can practice it. Commencing (Qǐshì, 起势), Prep...
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Protein Prescription for Aging Muscles: Why Leucine Matters More After 60

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The Muscle-Building Supplements That ACTUALLY Work (YouTube link ) Muscle and bone health aren’t just parallel concerns—they’re mutually reinforcing systems. Protecting one helps preserve the other. That’s why interventions like resistance training, adequate protein (especially leucine), vitamin D, and mobility-focused exercise are central to healthy aging strategies. Leucine: A Key to Combating Age-Related Muscle Loss  Maintaining muscle mass is difficult as we age due to anabolic resistance , a reduced ability of aging muscle to respond to protein and exercise (Breen & Phillips, 2011). This resistance is a major factor in sarcopenia ( age-related muscle loss ). To counter this, older adults need a higher protein intake ( 1.2–2.0 g/kg of body weight/day , compared to 0.8 g/kg for younger adults) and should aim for 25–40 grams of high-quality protein per meal (Deutz et al., 2014; Moore et al., 2015). Leucine , a branched-chain amino acid, is the primary trigger for muscle pr...
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