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Jellyfish Lake, Republic of Palau, Micronesia. The jellyfish evolved in the lake without any predators, and over time grew vegetarian and lost their ability to sting.

As an algebra teacher...this is even more hilarious. Except for usually we ask students to find y (y=mx+b) or put things into standard form (Ax+By=C). I never used to think adding, subtracting, multiplying and dividing was hard until I taught Algebra....