Answer:
The more you take, the more you leave behind.
There is an ancient invention. Still used in some parts of the world today. That allows people to see through walls.
how many letters are there in the alphabet
Man walks over, and man swims under. In times of war, it can be burned asunder. What is it?
I don't think or eat or slumber. Or move around or fear thunder. Just like you I look the same but I can't harm you or be your bane.
I am the fountain from which no one can drink. For many I am considered a necessary link. Like gold to all I am sought for, but my continued death brings wealth for all to want more.