In a classic bulb, a white-hot tungsten filament gives off light... and a lot of heat. According to the US Department of Energy, about 90% of the electricity it used was lost as heat, with only 10% turned into light. A good-quality LED uses at least 75% less energy for the same light and lasts up to 25 times longer. That's why Europe gradually pulled incandescent bulbs from the shelves.
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.