Answer:
The thinkers usually hold this body part
Humans have two that shrink in the light and expand in the dark
What is the middle of water but is not an island?
It flows out of the soil, It burns you if it boils, And holds us in its coils, More valuable than gold, As black as it is old.
They are two brothers. However much they run, they do not reach each other.
A word of five letters, Upside down is the same, A shark does this, But itβs not to blame. What is the word?