With hacky sack, somebody brought one to recess in sixth grade and it kind of all went downhill from there! The same with the yoyo's! One kid brought a yoyo one day and people started getting them. I just kept at it and found that I really loved it.
The key to proving that there's a black hole is showing that there's a tremendous amount of mass in a very small volume. And you can do that with the motions of stars. The way the star moves around the center of the galaxy is very much like the way the planets orbit the sun.
No matter how good a driver you are, you have to have the right car and the right team behind you in order to succeed.
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