Sometimes I am light, sometimes I am dark. What am I?

Answer: chocolate

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Sometimes I am liked, sometimes I am hated. Usually I am old, usually I am dated. What am I?
Sometimes I fly as fast as the speed of light. Sometime I crawl as slow as a snail. Unknown until I am measured but you will certainly miss me when I’m gone. What am I?
Sometimes I shine, sometimes I’m dull, sometimes I am big, and sometimes I am small. I can be pointy, I can be curved, and don’t ask me questions because even though I’m sharp, I’m not smart enough to answer you. What am I?
Step on me and you'll reach the top first, but step under me and you're cursed. What am I?
Stolen from a cow, I'm placed in a vat. My flavor gets stronger the longer I've sat. What am I?
Sweet, sour, tart, and sugary, you can see me in every store and in every pantry. What am I?
Swifter than the fastest horse, through four rooms I run my course. I appear crimson in the light, but blue is what I am at night. What am I?
Take away my first letter and I remain the same. Take away my last letter and I remain unchanged. Remove all my letters and I’m still me. What am I?
Take away my first letter, take away my second letter, take away all my letters and I would remain the same. What am I?
Take me for a spin and I'll make you cool, but use me in the winter and you're fool. What am I?
Take off my skin - I won't cry, but you will! What am I?
Take off my skin and I won't cry, but you will, What am I?