3) Late in the book, while explaining another theory Deutscher writes, "Their idea was simple, but like most other clever ideas, it appears simple only once someone has thought of it." (page 226) I'm sure the statement is true, but I can't think of any examples. Can you?
Why is the sky blue? Rayleigh Scattering.
Trigonometry is best explained using a circle (unit circle).
Archimedes eureka moment in the bath that allowed him to test the quality of gold in a crown.
Hot air balloons.
and from the actual playground of elementary school: Gravity sucks!
