Simple riddles

You've heard me before, yet you hear me again, Then I die 'til you call me again.

Throw away the outside and cook the inside, then eat the outside and throw away the inside. What is it?

If you see a bird sitting on a twig, how could you get the twig without disturbing the bird?

What am I?

I am seen in the water if seen in the sky, I am in the rainbow, A jay's feather, And lapis lazuli.

Glittering points That downward thrust, Sparkling spears That never rust.

What always sleeps with his shoes on?

Suppose you want to send in the mail a valuable object to a friend. You have a box which is big enough to hold the object. The box has a locking ring which is large enough to have a lock attached and you have several locks with keys. However, your friend does not have the key to any lock that you have. You cannot send the key in an unlocked box since it may be stolen or copied. How do you send the valuable object, locked, to your friend - so it may be opened by your friend?

Die without me, Never thank me. Walk right through me, Never feel me. Always watching, Never speaking. Always lurking, Never seen.

I live in the ocean. I have eight legs, two big claws and a tail. My body has a hard shell. I eat anything I can find. I am a...