Under a 1988 decree, the name 'yaourt' is reserved in France for milk fermented by two specific bacteria: Streptococcus thermophilus and Lactobacillus bulgaricus. They must be alive in the finished product, at a minimum of 10 million per gram. These microbes turn lactose into lactic acid, which makes the milk proteins set. A product heat-treated after fermentation loses the right to the name.
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.