The physics TA showed us a few examples in which one can estimate many things from first principles, sound logic, and scaling arguments. This led usually to understanding of why some numbers have the values they do.
I asked myself a few questions and after struggling with them, I could not get a clear answer:
Why is our body temperature is about 30 C? Is there a way to understand where that number comes from?
Why is the pregnancy period in humans is about a year, not 10 years, not a month?
Why is our life time about 100 years, not 1000, not a year?
Any help will be really appreciated.
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