One way I'm loose, one way I'm tight. Out with left, in with right. What am I?

Answer: A screw

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One where none should be, or maybe where two should be, seeking out purity, in the kings trees. What am I?
Only one foot tall but I govern you. What am I?
Only two back bones and a thousand ribs. What am I?
People always ask for me even though they don’t like to face me. What am I?
People buy me to eat, but never eat me. What am I?
People need me yet they give me away every day. What am I?
People say I put doctors out of business, sometimes I am sour, sometimes I am sweet, I can be eaten and can also be drunk. What am I?
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Physicists have built devices to make me move quickly. My last eight letters can be commonly found in newspapers, magazines, and journals. What am I?
Physicists have built devices to move me very fast. My last seven letters can be commonly found in newspapers, magazines, and journals. What am I?
Poke your fingers in my eyes and I will open wide my jaws. Linen cloth, quills, or paper, my greedy lust devours them all. What am I?
Ripped from my mother's womb, beaten and burned, I become a blood-thirsty slayer. What am I?