Found in 5 comments on Hacker News
Evgeny · 2015-12-08 · Original thread
Until a scientist in Australia proved ulcers were caused by bacteria. So consensus was wrong. Very wrong.

Interestingly, among people who have Helicobacter pylori in their stomachs, only a subset develops ulcers. Some people have bacteria, but no ulcer. I don't know if there is a consensus on why this happens, but it is correlated with stress. If you are stressed and have h.pylori, you are more likely to develop an ulcer, compared to h.pylori and no stress.

So the consensus was wrong, but still not a hundred percent wrong.

Source: Why Zebras Don't Get Ulcers, Third Edition

Quite a fascinating book on stress.

rogeryu · 2015-12-01 · Original thread
Good to know is that the first time you take cocaine, it works about 1000 times stronger than the natural drugs in your brain, and thus the natural highs you get. These are the normal highs you get when you score a goal in sports, when you get an A for your exam, when the girl or boy you like wants to kiss you etc.

So the first time(s) you use cocaine, you get a high that's incredible. The second time, this effect is about 100 times stronger than usual, so 10 times less strong than the first time.

Then you want to go back to that first unbelievable fantastic time, and take more. You may get at 200, but the more often you take it, the less the effect, and the stronger the craving for it. This is more or less how (this) addiction works.

The numbers I use here may be different, but it shows more or less how it works. Well as far as I understood it from the book Why Zebras don't get Ulcers which is about stress and all its side effects.

"Zebras don't get ulcers" by Robert Sapolsky [ ] Great book on stress, it's evolutionary role and how it's screwing us up now, in the modern environment that's quite different from our evolutionary past.

"Brain Rules" by John Medina [] John, a molecular biologist, looks at things such as health and cognitive development and performance of kids and adults from an evolutionary perspective. He highlights problems with our approaches to work and study, how these are at odds with the way our brains evolved to work and what we can do about it. Great collection of actionable advice backed up by current research. See more at

"The world until yesterday" by Jared Diamond Great book on how "traditional" societies handle trade, war and interpersonal conflicts. Lots of thing to consider taking on board in "modern" societies - such as restorative justice.

"The Antidote: Happiness for People Who Can't Stand Positive Thinking" by Oliver Burkeman Great overview of pitfalls that "positive thinking" approach brings and how one can start employing alternative ways of attaining happiness.

1. Chaos: Making a New Science [ ] still makes an awesome read despite its age.

2. Why Zebras Don't Get Ulcers [ ] - great book on stress and its effects by Robert Sapolsky (have you seen his lectures on behavioural biology? Fascinating stuff, even if you always thought 'meh, biology' - the guy is an amazing lecturer)

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