What is acceleration, what are the current hypotheses about the causes of acceleration

Acceleration or acceleration (from lat. Acceleratio-acceleration) – the accelerated development of a living organism.
In support of acceleration, a wide variety of hypotheses have been proposed, which can conditionally be divided into several groups:
– First of all, nutraceutical, associated with a change (improvement) in the nature of nutrition, especially in the last three decades after the Second World War.
– Hypotheses related to biological selection (the first reports of accelerated development of children – Ghent, 1869; Roberts (Ch. Roberts), 1876), with an increase in the number of heterolocal (mixed) marriages – heterosis, an attraction to urban life, as a result of which people come to cities the most developed inhabitants from the countryside are the Mauer hypothesis (1887), as well as other hypotheses about constitutional selection – for example, the desire to occupy the higher layers of society or the resettlement of people with a more developed intellect in cities.
– A group of hypotheses related to the influence of environmental factors (hypotheses of the 30s) associated changes in the rate of growth and development with natural and artificial changes in environmental conditions. Koch (E. W. Koch), 1935, who proposed the term acceleration, attached importance to heliogenic influences, an increase in daylight due to electric lighting. Treiber (T. Treiber), 1941 associated the acceleration with the influence of radio waves – although the acceleration of the growth of children began before the widespread distribution of radio on Earth, and Mills (C. A. Mills), 1950 – with an increase in the temperature of the Earth’s atmosphere. There are other hypotheses, for example, associated with radiation or cosmic radiation. But then the phenomenon was to manifest itself in all the children of one locality. However, all authors note differences in the growth rate of children of different populations.
Each of the hypotheses separately could not explain all the phenomena of the secular trend and convincing evidence would be data on the acceleration of ontogenetic development and increase in body size not only in humans, but also in various animals

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