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At least a dozen African National Congress (ANC) politicians have been killed in the lead up to South Africa's election. CNN's David McKenzie reports.

How easy is it to get from one Olympic venue to the other? CNN's Christina Macfarlane shows us.

Elizabeth Holmes, the CEO of Theranos, escorted CNN Chief Medical Correspondent Dr. Sanjay Gupta around her famously secretive research and development lab.

A group of scientists tested Rio's beaches for a year, and discovered high levels of dreaded "super bacteria." CNN's Shasta Darlington reports.

Donald Trump told voters in Ohio that the political system is "rigged." The presidential candidate discussed Bernie Sanders' loss.

CNN's Michael Holmes speaks to Pawel Krzysiek, a spokesman for the International Committee of Red Cross, about the humanitarian crisis in Aleppo, Syria.

A Marine veteran says he was kicked out of a store in New Orleans because he had a service dog.

Khizr Khan, the father of Gold Star Capt. Humayun Khan, tells CNN's Don Lemon how he came up with the idea to show the U.S. Constitution while criticizing Donald Trump at the DNC.

CNN's Gary Tuchman looks at the dangers of riding in a hot air balloon and what it takes to safely fly one.

Berkshire Hathaway CEO Warren Buffett is joining fellow billionaires Mark Cuban and Michael Bloomberg in backing Hillary Clinton over Donald Trump for president. CNN's Brynn Gingras reports.

Speaking at a rally in Mechanicsburg, Pennsylvania, Donald Trump described Bernie Sanders' endorsement of Hilary Clinton as a deal with the devil.

Billionaire Warren Buffett explains how last time Donald Trump asked the public to bet on him, investors who trusted him lost a lot of money.

Mike Pence defended Donald Trump's response to criticism from the Gold Star family of Humayun Khan during a campaign rally in Reno, Nevada.

CNN's Drew Griffin looks into allegations that Donald Trump pushed to change the language in the Republican National Convention platform to soften its stance on Russia.

Donald Trump says thousands of his supporters were turned away from a political rally in Columbus, Ohio, for political reasons.

Flint, Michigan, has suspended trash collection until further notice because city leaders failed to secure a new waste collection contract for the city.

Skydiver jumps without parachute and lands HERE. CNN's Jeanne Moos reports.

Texas has become the 8th state in the U.S. to allow guns on campus. CNN's Ed Lavandera reports from Austin.

Billionaire Warren Buffett is supporting Hillary Clinton for President. But, acknowledging voter access problems for people without cars, he also wants his district to have the highest voter turnout 'of any district in the country.'

In a campaign event for Hillary Clinton, billionaire Warren Buffett challenges Donald Trump to make his income tax returns public. 'You're only afraid if you got something to be afraid about,' he says.