The difference in looks comes from manufacturing. In the final rolling stage, the foil is so thin that two sheets go through the rollers together. The sides touching the polished rollers come out shiny; the sides pressed against each other come out matte. According to manufacturer Reynolds, both sides cook and protect food the same way. The one exception is nonstick foil, which is coated on one side only.
Chlorine on its own is fairly gentle. But when it combines with urine, sweat and other grime from swimmers, it forms chloramines, which cause stinging eyes and that classic 'chlorine smell'. A well-kept pool barely smells at all. Shower before you swim and never pee in the water.
Muscle mass slowly shrinks with age, putting independence at risk. But in 1990, a study had nursing home residents aged 86 to 96 train their legs for eight weeks: their strength more than doubled. Muscle responds to training at any age. Getting up from a chair without using your hands is already an exercise.