Good Riddles

Question: Which is correct "The yolk of the egg is white" or "The egg yolk is white?"

Question: Every time a man lies his nose grows to 150 percent of its size. Every time he tells the truth it shrinks to 50 percent of its size.

What will happen if he alternates between lies and the truth?

Question: Something different to show every week, but I'm still the same place.
If you're eating it's probably butter that you taste.

What am I?

Question: A box of marbles costs $20. If the marbles are worth $19 more than the box, what is the box worth?

Question: We have what we did not find; what we did find we left behind.

[What do we have?]