The method: wrap butter in dough, roll it out, then fold it in three. Each of these 'turns' triples the number of layers. After the six turns of the classic recipe, you get 3 to the power of 6: 729 layers of butter separating 730 sheets of dough. In the oven, the water in the dough and butter turns to steam and pushes the sheets apart. That's what makes it puff.
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.