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The iconic 20th century physicist Richard Feynman invented a method for calculating probabilities of particle interactions using depictions of all the different ways an interaction could occur. Examples of “Feynman diagrams” were included on a 2005 postage stamp honoring Feynman.

Physicists reported discovery of a jewel-like geometric object (the amplituhedron) that dramatically simplifies calculations of particle interactions and challenges the notion that space and time are fundamental components of reality.

Why Do I Study Physics? (2013) from Xiangjun Shi

Is that a wave, an orbit, or an electron? The transition between classical physics and quantum physics is always fascinating. How does an object go from behaving in a deterministic manner to occupying the quantum world, where its activities are a matter of probability? At the boundary between the two, we cannot behave as if something is entirely classical or entirely quantum—rather, we need to treat it as a mixture of the two.

## Artist’s rendering of the amplituhedron, a newly discovered mathematical object resembling a multifaceted jewel in higher dimensions. Encode...