Answer:
When you need me, you must find me. When you find me, you no longer need me. What am I?
I am a ship that can be made to ride the greatest waves. I am not built by objects but built by minds.
I can bring tears to your eyes, resurrect the dead, make you smile, and reverse time. I form in an instant, but I last a lifetime. What am I?
I am a mini solar powered computer.
I can speak with my hard metal tongue. But I cannot breathe, for I have no lung. What am I?
What kind of dog has no tail?