Researchers have always used bacteria, yeast, worms, fruitflies, fish and rodents in laboratories since experimentation on humans is often unfeasible and presents with an ethical conundrum. These model organisms are chosen depending on the nature and complexity of study and the cost and convenience of its maintenance. Zebrafish (Danio rerio) is today a favourite model organism for various biological research studies for well deserved reasons.
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Black holes are the celestial objects with such immense gravity that nothing can escape from them -- not even light!
If someone came up to you and said the stool from one person can be used as medicine to treat another, you’d most likely be disgusted or find it absurd. It sounds incredible, but it is true.