Answer:
What has roots that nobody sees, and is taller than trees. Up, up it goes, and yet it never grows.
Used on a diamond and left on a board. It's great for a gymnast his grip to restore. What is it?
Two people are born at the same moment, but they don't have the same birthdays. How could this be?
Until I am measured I am not known, Yet how you miss me when I have flown.
This thing all things devours: Birds, beasts, trees, flowers; Gnaws iron, bites steel; Grinds hard stones to meal; Slays king, ruins town, And beats high mountains down.
What can you lose that will cause other people to lose theirs too?
Difficult
Animal
Easy
Food
Funny
Kids
Logic
What am I?