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It's a mystery how butterflies manage to make their brilliant wing colors, but Yale physicists got a glimpse when they took the question to the lab, breeding dull brown butterflies into purple ones.

A new study argues that taxing sodas and sugary drinks by the calorie would spur consumers to cut back. A 6-cent tax per 12-ounce can would lead to 5,800 fewer calories consumed per year, it found.

Putin has been declared the winner in Sunday's Russian election, giving him a fourth term as president. Critics say the vote was staged, and the only questions are over the size of Putin's majority.

Two pardoned Jan. 6 rioters posted photos and videos of themselves visiting the White House. One of them was convicted of assaulting police and texted after the riot, "I have murder in my heart."

The latest report from the Bureau of Labor Statistics shows the rate for July was little changed from June's 6.1 percent.

The Senate and House have approved a $1.5 trillion government spending package, plus $13.6 billion in emergency funding for Ukraine. Billions in new COVID aid requested by the White House was cut.

Jurors continue to hear closing arguments in the trial of Steward Rhodes and four other members of the far-right militia, charged with seditious conspiracy for their role in the Jan. 6 attack.

As Democrats wrap their third night in Chicago, the Democratic National Convention continues its message of freedom and readies itself for its final night: the speech from Vice President Harris.

Moderna is testing its COVID-19 vaccine in children — ages six-months through 11 years old. NPR's A Martinez talks to Dr. Steve Plimpton, who is the principal investigator for the study in Phoenix.

NPR's Elissa Nadworny speaks with Jan. 6 committee member Rep. Pete Aguilar, D-Calif., about where his panel's investigation stands ahead of the one-year anniversary of the attack.