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Given two choices of attractive mates, female frogs pick the top vocalist. But add a third, inferior male to the mix, and females go for No. 2. The "decoy effect" shapes some human choices, too.

Some 15 million people are expected to attend the Olympic games in Paris, which are now in their second week. Keeping them safe is a top priority, so the French government has brought in soldiers.

Violent crime is on the rise in many urban areas across the country, giving Republicans what they believe is an opening in key swing districts that could decide control of Congress next year.

Bernie Sanders boosted his national reputation by filibustering a tax deal brokered by Joe Biden. Years later, the two are fighting for the Democratic presidential nomination.

After a summer that included two strong debate performances, the Massachusetts senator has seen a rise in fundraising, polls and crowds. But can she win it all?

Companies from Ford to Microsoft are part of a growing protest over how the social media giant handles hate speech and other harmful content.

Fierce competition to get children into the top schools has spawned an aggressive parenting culture named for a traditional-medicine treatment in which chicken blood is injected to stimulate energy.

With the James Webb Space Telescope safely deployed, many scientists want to use it. To minimize the effect of unconscious biases, they go through a process developed for the Hubble Space Telescope.

Farmers in Ukraine begin to harvest this year's wheat, barley and rapeseed crops as diplomats try to negotiate an end to Russia's Black Sea blockade of exports.

There is a good chance these will be the last bids for seats in Congress for two of the best-known women in American politics — Republican icons Liz Cheney of Wyoming and Sarah Palin of Alaska.