Longevity claims are unsubstantiated cases of asserted human longevity. This leads to the study of renewal theory and reliability theory of ageing and longevity. Nerve growth factor may contribute to increased longevity and mental capacity. Chosen for its longevity and stability over centuries. The charging engine runs at optimum speed and load for efficiency and longevity. It appears to reduce the longevity and fecundity of female braconid parasitoids. Sustainability comes in reference to longevity and effectiveness. These include divinities of wealth, longevity, fertility. A meme which increases the longevity of its hosts will generally survive longer. Traditions that have been believed to confer greater human longevity include alchemy. Stability (that is, longevity) of their substrate is a major factor of lichen habitats. Many parts of a piano are made of materials selected for strength and longevity. It is relatively chemically inert, which contributes to its longevity. The former experience reductions in queen fecundity, dispersal, longevity, and nestmate relatedness. He is the god of wisdom, luck, longevity, wealth and happiness.