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"Carbon credit" written in the clouds over a lush green forest

Explained: Carbon credits

Can carbon trading systems reduce global emissions, or are they little more than greenwashing? Clear, enforceable standards may make the difference.

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Graph theory is generally thought of as originating with the "Königsberg bridge problem," which asked whether a walker could cross the seven bridges of Königsberg, Prussia (now Kaliningrad, Russia), once each without crossing any of them twice. This is the graphical depiction of theproblem, where the nodes represent land masses and the edges bridges.

Explained: Graphs

A simple tool for representing relationships between data, devices or almost anything else has ubiquitous applications in computer science.

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