>I believe menopause is triggered when a woman's body has no more eggs to release

There is nothing to "believe". It is proven science that says the ovarian follicles stops working at a certain age, no matter how many egg cells still are in there, which means lower blood hormone levels as the follicles during the fertile period produce estrogens, androgens and progestins.

There are kinds of coffee that have very low acid and are kind of more "stomach-friendly", just search for low acid coffee. And the anxiety is caused by caffeine, so decaf could work?

"Planet Earth" has shown a mother polar bear hibernating. She gave birth in her den, nourishing the little ones until they are big enough to follow and withstand the cold. She does not leave until then and is really famished. And you see her rolling around in the snow to clean herself.

Yes, you can, but not everything and not always. CT scans can show that certain brain areas are underdeveloped which can lead to symptoms like depression, psychopathy (not sure, what the exact term is, there is always discussion about what to call it) or others. Also the brain has a huge capability of taking over the functions of damaged areas in other areas, so just because it might look heavily damaged it does not always concur with the clinical representation of the patient. There can literally be patients with half a brain and you would not notice apart from their brain scan. Have seen such cases myself. One of them was a miracle to the neurologists because he was a skilled worker at a bank and had a healthy family life with nearly no brain.

Thank you for clarifying that, I did not know (and I'm a nurse)!

I think this has to do with several factors. I will use cholesterol as an example.

Factor A: testing methods change over time, I doubt the methods of 1930 were the same or as exact as they are today

Factor B: research of acceptable factors, cholesterol for example is usually divided into two sorts, and for years it was state of the art too high cholesterol of any sort is bad, then it changed to one sort being the "good" cholesterol, so higher levels should be tolerated of this kind and lower of the other kind

Factor C: this may surprise, but... pharma industry, they profit from lower tolerance as there is a huuuuge market for statins (I could name half a dozen statins right now), so they commission studies which show the wanted results and many people do not know how to look at the studies and results properly

Factor D: actual change in eating habits, genes, environment, etc.

Lethal dosis needs to be determined, which is called LD50 (meaning at this dosage 50% of test animals died). Then lower dosages are tried to show effects. The usable dosage is called "therapeutical range" which describes the dosage range in which the desired effect takes place without being toxic. The broader this range, the safer the med. Many meds have a tight range which means the dosage needs to be monitored and adjusted closely (e.g. certain seizure meds).

Way too much risk, also it is usually recommended by the health departments. And the stable or where they are kept in needs to be sanitized, with surviving birds you can't be sure you get all of it which would endanger humans and birds alike. Also they usually just buy chicks or eggs and feed them until big enough which does not take long. Compared to nursing ill birds back to health it's probably more cost effective.

Both differ genetically enough from the domesticated variants and took different paths thousands of years ago. In fact it is not sure the Przewalskis were from a domesticated group. They also show a huge lot of characteristics common in wild horses and may be a mix of the last remainders of wild living horses in Europe and domesticated ones. But there are enough other examples. In birds there are about 4000 proven examples of hybridization, half of it due to captivity, the other half occuring naturally, but the numbers are estimated to be higher as it is not always possible to identify wild living hybrids. Also we humans are hybrids, there's still Neanderthal DNA found in us.

Completely normal. Even hybrid bears have been known (polar bear x grizzly). The Dingo population in Australia is suffering because they mix with feral dogs. It made the news when a 100% pure Dingo puppy (of a certain sub species) was found, he is now fathering little Dingos to help the species. Other animals also sometimes mix. I guess we never notice most hybrids as they either stand out and are preyed upon or just are not seen because it's obviously impossible to monitor this everywhere at all times.

The comparison to the hunter/gatherer stage is not really fitting as our live circumstances have vastly changed. We live in cities with thousands or millons of other individuals, even if we live in a rural area, going to the supermarket or something like that brings us in more contact than hunter/gatherer groups might have had in months. Thr advantage might be simple energy and resource costs to produce vitamin c. At some point, our nutrition covered the necessary daily intake enough so that there probably was no point anymore to spend bodily resources in producing it. Other mammals can still produce it, so it might have been intense, kind of knowledgable foraging (of course I know they didn't know about vitamin c, but they must have found certain plants are better than others) or agriculture, that brought us this way.