Even though black holes tries to describe, that the first positive influence is to create nice studying forum for scientists, is weird to miss the main positive influence of black holes: creating life.

Black holes seem to create star groups: when oversized star has born, it will be unstabile and after its short life will create a black hole. The remnants are probably within black holes gravitational field, and create new much smaller suns which are able to live.

Where is "our" black hole? (the black hole which has created our sun, where is it?)

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Urban legend within science fiction is a black hole (which is even visible for us) sucking all near-by matter. Black hole is

• Much like a sun, but invisible and has huge gravity. We are not sucked by our own sun either. Huge gravitational targets will rotate matter around itself (like our sun does).
• In black hole space-time is different. Have been thinking black hole is just implosed star in a frozen time (actually not frozen, but extremy slowly moving).

001	Carr Bernard J. and Giddings Steven B.: Quantum Black Holes Scientific American, 2005 May, Volume 292, Number 5, pp.48-55