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Nigeria's President Goodluck Jonathan concedes defeat

The Brief

Members of the Arkansas House of Representatives meet in the House chamber at the Arkansas state Capitol in Little Rock, Ark. on Jan. 12, 2015.
Danny Johnston—AP
Secretary Kerry sits with German, Chinese, European Union, French, British, and Russian colleagues ahead of the negotiations with Iranian officials to discuss the terms of the new agreement on Iran's Nuclear Program in Lausanne, Switzerland, on March 31, 2015.

Iran Talks Extended a Day

Iran and six world powers will pass the negotiators' self-imposed Tuesday night deadline, but Iranians feel a peaceful resolution is at last within grasp

Nigerian Presidential Elections

Buhari Wins Nigeria Election

Nigerians voted President Goodluck Jonathan out of power Tuesday in a stunning upset, handing former military dictator Muhammadu Buhari the presidency

Trevor Noah Responds to Backlash Over Past Tweets

The successor to Jon Stewart fittingly took to Twitter to address his critics, claiming that his Twitter history is "not a true reflection" of his character. Noah had been accused of anti-Semitism and sexism after his followers began to retweet and comment on his old posts

A picture shows the logo of the online retailer Amazon dispalyed on computer screens.

Amazon Launches Store for Science-Mad Kids

Amazon on Tuesday introduced a new online store focusing on STEM (Science, Technology, Engineering and Math) toys that help children develop valuable skills in in-demand fields. The top pick on the store’s front page was a child-friendly microscope

Coal plant

White House Plans to Cut Carbon Emissions by up to 28%

The White House reaffirmed a commitment to cut carbon emissions by up to 28% by 2025 in a Tuesday submission to the U.N. that promises new regulations on power plants, new fuel economy standards for some vehicles and rules to address methane emissions

Members of the Guinean Red Cross move the body of a person who died from the Ebola virus on March 8, 2015 at the Donka hospital in Conakry.

Ebola Cases in West Africa Top 25,000

The outbreak, which has persisted for more than a year, had infected 25,178 people in Liberia, Guinea and Sierra Leone as of Tuesday, and killed 10,445, according to new numbers released by the World Health Organization (WHO)

ice-hockey player

Hockey Helmets May Not Prevent Concussions, Study Shows

Researchers say the sport with the highest rate of concussions suffers from a dearth of effective safety helmets. Price appeared to have no effect on performance, with helmets priced at $100 outperforming helmets at triple the price

Former U.S. Secretary of State Hillary Clinton takes part in a roundtable discussion in Washington, DC, on March 23, 2015.

Hillary Also Used iPad Despite Claims of Single Device

Hillary Clinton emailed her staff on an iPad as well as a BlackBerry while secretary of state, despite her explanation she exclusively used a personal email address on a homebrew server so that she could carry a single device, according to new documents