How Your Body Is Engineered?
In India, it was taught that you shouldn't sleep with your head to the north. Why?
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Because pumping blood up against gravity is harder than pumping it down, your heart is three-fourths of the way up instead of halfway down. In comparison to blood arteries that travel downward, those that ascend have a more refined configuration.
They become so thin and nearly hair-like as they ascend to the brain that they are unable to absorb even one more drop. Something will explode and cause a bleed if just one more drop is poured in.
The majority of persons develop brain hemorrhages. You are not seriously disabled by this, but minor injuries do occur. You might become duller, as people are doing.
After the age of 35, if you don't take great care to maintain it, your level of intelligence begins to decline in many ways. Your memory, not your intelligence, is what allows you to manage.