Thousands of dams across the US are aging and overdue for maintenance. Taking them down can revive rivers, restore fish runs and create new opportunities for tourism and outdoor activities.
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To untangle the relationship between climate change, fall foliage and national park visitors, researchers are asking tourists to check their old photo albums for snapshots that could hold valuable data.
The system allows voters to pick their first, second- and third-choice candidates – and could encourage more civil campaigns.
Some American voters hope that instant runoff can make our elections better. But a mathematician has an idea for another solution.
In this year's election, the system of majority voting didn't allow voters to express their opinions adequately. If they had, the choice would have been between Kasich and Sanders.
What if you could go into a voting booth and rank your first, second and third choices? It could happen in Maine, if voters approve.
Top contributors
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Law Professor in Constitutional Law, Criminal Law, Election Law, University of Memphis
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Directeur de recherche de classe exceptionnelle (emeritus) of the C.N.R.S., École polytechnique
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Professor of Mathematics, Tufts University
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Assistant Professor of Climate Change & Remote Sensing, University of Richmond
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Assistant Professor of Science, Emerson College
