Walking efficiently takes next to no thought

Whether walking beside a lake or clambering a mountain, people adjust their strides to use the least energy possible. "People are continuously sensing their energy expenditure and adapting their gait to minimize costs," says ...

Can AI make democracy fairer?

Democracy in ancient Athens looked quite different from democracies today. Instead of elections, most offices—including those in the legislature, governing councils, and magistrates—were filled by citizen volunteers, ...

Helping baby toads is their labor of love

As baby toad season winds down in the Roxborough area of Philadelphia, volunteers are still busy helping the frenetic little critters make it alive across Port Royal Avenue.

What motivates the green volunteer?

Countless numbers of volunteers throughout the world are dedicated to nature: via citizen science or through activities like planting trees or organizing nature excursions. But who are these people and why do they take action? ...

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