If I Had A Time Machine

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This is something that I have actually thought about a lot.
There are many things I'd like to do but when I am dreaming of having this time machine, I limit myself to only 3 things to change. The things are basically the same but sometimes change in priority depending on the mood I'm in.
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First of all I would not go to the future to see how things will turn out. I don't want to know. It's better if it's a surprise. Besides, it could be depressing.

No, I would go in the past. In one of my little fantasies, I go back to when Microsoft, Apple, Amazon, Yahoo, Google and Bitcoins first hit the stock market. I would be sure to invest in all of those. Take half the money I made from the first 5 and then put that half into the Bitcoins. I dream of it being about $20M to invest in Bitcoins. Not because I really want to be rich, but I would like to be able to do what I wanted, when I wanted, especially vacations. Of course, I would help the less fortunate so they could go on vacations also.
In another little fantasy I go back and correct a few things I screwed up back then. There is one big thing that I really, really would like to change. Some property with a house on it. I tore down the house and later sold the property. I wish I would have done neither of those things.
Another little fantasy I'm not going to put in writing. Not because I can't write it without the sexual content but because someday, someone I don't want to read it, might read it.
Yeah, any one of those little fantasies would work for me.

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I just saw a lot of people doing this topic and figured it was some kind of contest. I hope I do enough to get in the contest. I did not see any rules.