A month ago the results of a successful cholera vaccine project in Haiti became available. Now the World Health Organization is calling for the establishment of a global stockpile of the vaccine to respond to outbreaks like Haiti's.

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MELISSA BLOCK, HOST:

It has become the deadliest protest in South Africa since the end of apartheid: 34 people dead and more than 78 wounded after police opened fire yesterday on striking workers at a platinum mine northwest of Johannesburg. The miners had walked off the job a week ago, demanding an increase in wages double to triple what they were making. Today, South Africa's National Police Commissioner Riah Phiyega said officers were acting in self-defense after armed miners charged their position.

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A law professor and his students have put together a dictionary of Supreme Court pronouncers. It details how to pronounce the sometimes obscure or ambiguous names of cases going back to the beginning of the republic.

The Treasury Department Friday changed the terms of its bailout agreement with Fannie Mae and Freddie Mac. The mortgage giants often had to pay the government back more in interest than it earned in profits, a system at odds with the goal of eventually dismantling the companies. The move appears aimed at calming financial markets.

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MELISSA BLOCK, HOST:

We're going to talk about this question of taxes and more with our Friday political commentators, E.J. Dionne of The Washington Post and subbing for David Brooks this week, Reihan Salam of National Review. Welcome to you both.

E.J. DIONNE: Good to be with you.

REIHAN SALAM: Thanks for having us.

We're hearing from all the candidates on the presidential campaign trail this week. We listen to part of a stump speech from vice presidential candidate Paul Ryan in Glen Allen, Va.

After weeks of saying he would not release his tax returns, GOP presidential candidate Mitt Romney told reporters Thursday he had checked them and could report he had always paid at least 13 percent annual in federal income tax. But Romney still refuses to make public more of his tax returns, despite a new offer from the Obama campaign.

Congressman Dennis Cardoza, a Democrat from California, was retiring after this year. But why wait? A job with a big lobby-law firm was waiting, so the congressman resigned from Congress this week.

In the past two weeks, seven Afghans in uniform have opened fire on Western forces. The most recent incidents occurred Friday. First, a newly recruited policeman in western Afghanistan turned his gun on U.S. military trainers, killing two and wounding a third. A short time later in southern Kandahar province, an Afghan soldier shot and wounded two foreign troops.