Answer:
I have four fingers and a thumb, but I'm not living. What am I?
When you need me, you must find me. When you find me, you no longer need me. What am I?
I open to close but I close to open. I'm surrounded by water but I'm never soaking. What am I?
What can be cracked before it's used?
Physicists have built devices to move me very fast. My last seven letters can be commonly found in newspapers magazines and journals.
If itβs information you seek, come and see me. If itβs pairs of letters you need, I have consecutively three. What am I?