fluctuations

Prolonged exposure to sunlight, extreme temperature fluctuations, moisture and humidity all cause perovskite solar cells to degrade over time.

Additionally, ancient adaptation signals can be masked by genetic drift -- random fluctuations in the frequency that genes appear -- and population mixing, which causes certain adaptive traits to disappear from the gene pool.

According to the study, "fluctuations in density, energy and entropy in water are regulated by these quantum interactions, with effects ranging from the nanometre to the macroscopic scale," says researcher Luis E. Coronas.

Farming is a tough business, especially for small- and medium-sized farms, which can be rocked by the weather and fluctuations in commodities pricing and fuel costs.

Strictly is the jewel in the BBC’s crown, and whatever the fluctuations in viewing figures, it remains one of the biggest shows on TV.