Answer:
When a doctor hits you with a hammer he is testing this
What goes up let's of a load and come back down
They are Dark, and always on the run. without the sun, would be none!
Often wandering the streets, this group of people cannot afford to be choosers.
What is not a ball but yet a sphere, and holds all lands and people year after year?
A word of five letters, Upside down is the same, A shark does this, But itβs not to blame. What is the word?