Top 10 “Negative” Inventions

By Tom Siegfried, 18:24 PM October 2, 2013

Throughout the history of math and science, supposedly impossible negative things have repeatedly turned out to be important both mathematically and physically. Here is my unofficial (no, let’s make that official) Top 10 list of “negative” inventions.

10. Negative refraction: Victor Veselago, 1967

Refraction refers to how much light slows down (and therefore appears to be bent) when it passes through some medium. Refraction is quantified by an index relative to the refractive index of the vacuu...

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