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The histogram you show isn't a distribution of age-at-death for individuals, it's a distribution of life expectancies for different countries. The post you link takes data from a table on this page. Interpreting the histogram you posted, we see average life expectancy seems to hit a wall around 85. This does not mean that individual human life span is not ...


4

This is a question I also remember wondering about when I was younger in school. Now as a professional it's way too obvious to even explain. But i think it's an important and common question, which warrants an example or two from common daily lab practice. Preface You have to understand that DNA is a molecule. It's really tiny. It's not trivial to work ...


3

Some of the work of Bob Trivers makes some sense to me. He talks about parental investment https://en.wikipedia.org/wiki/Parental_investment. The "investment" of a man could be as little as paying for dinner, followed by a few minutes of sexual pleasure, and then he is free to go. The woman's investment for the same thing is the risk of pregnancy (or cryptic ...


2

They grow Nerve axons can grow rather quickly as long as the body of the cell is intact, quickly as in the mm/day range. This is also the basis of how nerves can regenerate.


2

There's no particular reason everything in nature needs to fit a normal distribution; normal distributions are just one of many different types of naturally-occurring distributions. In some cases, the other types can be transformed (e.g. by logarithms) into a normal distribution (e.g. a log-normal distribution), in other cases not so much. As to why it ...


1

In short: skipping a meal lowers blood glucose levels, which can reduce cognitive performance, for example, memory. Let's say that between meals you are in fasting state for 8 hours during which you do some desk work and some moderate exercise for 1.5 hours. With such level of physical activity, your last meal and your glycogen stores should provide enough ...


1

Keeping in mind that this was a very small, not especially well-controlled preliminary/exploratory study. Because life expectancy was increased by ~2.5 years - or got ~2.5 years younger biologically, depending on how you look at - it is the reason that this study is being talked about at all. In the TRIIM study 9 men, ages 51-65, first took hGH alone (0....


1

One reason for that delay in onset of cardiovascular disease could be that women are relatively iron-deficient compared to men — especially younger women, those in their late teens and early 20s — because of menstruation. Iron plays a very important part in the reactions in our cells that produce free radicals, which damage cell membranes and DNA, and may ...


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