In September 2017, Thames Water found a 'fatberg' 250 meters long and weighing around 130 tonnes beneath London's Whitechapel district. The monster was made of wet wipes flushed down toilets, cemented together by congealed cooking fat. A crew spent weeks breaking it apart with high-pressure jets. The lesson applies to every sink: oil and grease go in the bin, and wipes never go down the toilet, even 'flushable' ones.
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.