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My son was vigorously stirring a very hot cup of drinking chocolate as he thought that would cool it down. I said stirring the liquid was adding energy to it. Who is right? If him, what's the best speed to stir at to cool the hot chocolate? And if me, is it possible to heat it up by stirring very fast?
Your question about throwing stones leads me to another. I am left-handed, but like many of us in this back-to-front world, I can do most things fairly well right-handed. Yet when it comes to throwing overarm or skimming stones, I can only do it right-handed and not with my dominant hand at all. Does anyone know why this might be?