Answer:
I can run but not walk. Wherever I go, thought follows close behind.
What word has kst in the middle, in the beginning, and at the end?
A beggar's brother went out to sea and drowned. But the man who drowned had no brother. Who was the beggar to the man who drowned?
What has a head, a tail, is brown, and has no legs?
Lovely and round, I shine with pale light, grown in the darkness, a lady's delight.
You use it between your head and your toes, the more it works the thinner it grows.