Answer:
You can hold it without using your hands or arms. What is it?
I usually wear a yellow coat. I usually have a dark head. I make marks wherever I go.
You throw away the outside, eat the inside, then throw away the inside. What is it?
What can be measured but not seen?
Used on a diamond and left on a board. It's great for a gymnast his grip to restore. What is it?
It's what light turns into in the night