If you were given $500,000 but you're only allowed to invest it into a startup business of your choice, what would it be and why?

It doesn't matter what your age is. Let's assume you're young and have all the time and energy in the world. What business startup would you choose?
If you were given $500,000 but youre only allowed to invest it into a startup business of your choice, what would it be and why?
If you were given $500,000 but you're only allowed to invest it into a startup business of your choice, what would it be and why?
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