Often silent, a toilet leak can let up to 600 liters (about 160 gallons) slip away every day, according to France's water information center. That's roughly a family of four's daily water use. A dripping tap can lose around 120 liters a day. To check your toilet, add a few drops of food coloring to the tank: if color shows up in the bowl without flushing, you have a leak.
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.