Children are entering puberty younger than before, according to recent studies, raising concerns that childhood obesity and hormone-contaminated water supplies may be to blame. However, our archaeological research suggests that there’s nothing to worry about. Children in medieval England entered puberty between ten and 12 years of age – the same as today.
Of course, naturally, this isn’t the publicly perceived story. There’s still some science missing from the overall arc of the story, but people who believe that chemicals in the environment and hormones in food are causing children to start puberty at younger ages should be questioning why they think this is the case.
If anything, perhaps better first world lives may be pressuring the age down a bit, but even then it sounds like there’s a lower limit. Evolutionary effects are also certainly at play as well.
A long-harbored conservative dream — the “dismantling of the administrative state” — is taking place under Secretary Ben Carson.
I was just thinking yesterday, HUD has been awfully quiet. What has Ben Carson been up to?
The answer is appallingly painful, but seemingly par for the course, for the current administration.
While certainly having a particular point of view, this article is well reported with some great history/background, and specific examples. Sadly, it appears that the people Trump specifically said he was out to help are going to get the shaft even worse than I would have expected.
Driven by technological progress, human life expectancy has increased greatly since the nineteenth century. Demographic evidence has revealed an ongoing reduction in old-age mortality and a rise of the maximum age at death, which may gradually extend human longevity. Together with observations that lifespan in various animal species is flexible and can be increased by genetic or pharmaceutical intervention, these results have led to suggestions that longevity may not be subject to strict, species-specific genetic constraints. Here, by analysing global demographic data, we show that improvements in survival with age tend to decline after age 100, and that the age at death of the world’s oldest person has not increased since the 1990s. Our results strongly suggest that the maximum lifespan of humans is fixed and subject to natural constraints.
X. Dong, B. Milholland, and J. Vijg, “Evidence for a limit to human lifespan.,” Nature, vol. 538, no. 7624, pp. 257–259, Oct. 2016. [PubMed]
I ran across a link to this textbook by way of a standing Google alert, and was excited to check it out. I was immediately disappointed to think that I would have to wait another month and change for the physical textbook to be released, but made my pre-order directly. Then with a bit of digging around, I realized that individual chapters are available immediately to quench my thirst until the physical text is printed next month.