Have you ever seen a mustard seed?

A mustard seed is so small that if you were holding one in your hand and dropped it on the ground, you might not be able to find it.  Even though the mustard seed is one of the smallest of all seeds, when it is planted in the ground, it grows into a plant so large that birds can perch on its branches and can even build their nests in it.

 I have read that these tiny seeds can produce a plant that grows ten feet high or more!  It is hard to understand how something that starts so small can grow into something that big!