The quote is everywhere, yet there's no trace of it in his writings or in accounts from his lifetime: according to Quote Investigator, the attribution only surfaces decades after his death. The principle itself is real, though. €1,000 invested at 5% for 40 years earns €2,000 in simple interest, but grows to about €7,040 with compound interest, because the interest itself keeps earning interest.
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.