/u/BigBootyBear's posts in /r/askscience

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Why do mentally demanding activities (Ex - studying for a long time) can make our brain physically hurt, or make us mentally drained?

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Every person has 2 parents, 4 grandparents and so on. Going just 30 generations back (1066 AD), that means I have one billion direct ancestors (2 to the power of 30), even though there were no one billion humans alive at that time. How is that possible?

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Does the trope of a "genius hermit" which innovates outside of academia or a well funded R&D lab have any truth to it?

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After just the second decade of life, the intervertebral discs become avascular (blood flow stops). Why?

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What is it in lifting from your back (as opposed to from your legs) that hurts your back?

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When we wake up, we usually stretch our upper half of the body, especially the hands and shoulders. Lower body not so much. Why?

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If I shut my mouth and close my nostrils and blow my nose, air doesn't come out of my ears. Why?

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Is Anemia a symptom, or a disease?

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Whats the deal with capsaicin and coughing in clinical trials? How can it both induce coughing and suppress it?

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What's the importance of hitting your micro nutrient Recommended Dietary Intake?

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Title	Upvotes	Mark as read	Favorited	Rating	Add to a list
Why do mentally demanding activities (Ex - studying for a long time) can make our brain physically hurt, or make us mentally drained?	1
Every person has 2 parents, 4 grandparents and so on. Going just 30 generations back (1066 AD), that means I have one billion direct ancestors (2 to the power of 30), even though there were no one billion humans alive at that time. How is that possible?	1
Does the trope of a "genius hermit" which innovates outside of academia or a well funded R&D lab have any truth to it?	1
After just the second decade of life, the intervertebral discs become avascular (blood flow stops). Why?	1
What is it in lifting from your back (as opposed to from your legs) that hurts your back?	1
When we wake up, we usually stretch our upper half of the body, especially the hands and shoulders. Lower body not so much. Why?	1
If I shut my mouth and close my nostrils and blow my nose, air doesn't come out of my ears. Why?	1
Is Anemia a symptom, or a disease?	1
Whats the deal with capsaicin and coughing in clinical trials? How can it both induce coughing and suppress it?	1
What's the importance of hitting your micro nutrient Recommended Dietary Intake?	1