Answer:
What is lengthened by being cut at both ends?
You throw away the outside and cook the inside. Then you eat the outside and throw away the inside. What did you eat?
There are several different kinds, but the one you pick doesn't do its job. What is it?
Once they sailed the sea, now they surf the web
Two bodies have I, though both joined in one. The more still I stand, the quicker I run.
Almost everyone needs it, asks for it, gives it. But almost nobody takes it.