It sounds backwards but it makes sense: spare lithium batteries and power banks must travel in the cabin, never in checked luggage. If one overheats or catches fire, the crew can deal with it in the cabin, whereas a fire in the hold might be spotted too late. Under IATA rules, batteries up to 100 Wh need no approval; from 100 to 160 Wh you need airline approval; above that, they're banned. Since March 2026, ICAO also limits power banks to two per passenger, with no recharging on board.
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.