The brain is like a muscle. When it is in use we feel very good. Understanding is joyous.
— Carl Sagan (1934–1996)
Astronomer, astrophysicist, cosmologist, author, and popularizer of science
The brain is like a muscle. When it is in use we feel very good. Understanding is joyous.
— Carl Sagan (1934–1996)
Astronomer, astrophysicist, cosmologist, author, and popularizer of science