When voters go to the polls in California's primary on Tuesday, instead of only being able to vote for candidates in their own party, they will be able to vote for anyone they please.

Tuesday will be the first statewide test of California's new open primary system, where the top two candidates move on to the general election, regardless of party. Backers hope this system will favor moderates.

In California, there aren't very many purple areas. The state has strongly Democratic regions and strongly Republican regions — and the Democrats dominate.

How do you get people interested in the difference something as simple as a toilet can make for health?

If you're the head of the World Toilet Organization (yes, there is one), or the author of a page-turner about sanitation, or you're part of the Bill & Melinda Gates Foundation, you talk toilets up. A lot.

And, it turns out, if you're in Seattle, which considers itself the home for new ideas on global health, talking about poop and toilets will pack an 842-seat theater on a Friday night.

In a case involving then-Vice President Dick Cheney's Secret Service detail, the Supreme Court ruled Monday that agents accused of a politically motivated arrest are immune from suit. But the court's unanimous ruling did little more than resolve this particular case.

The decision stems from an incident in 2006 in the Colorado resort town of Beaver Creek, where Cheney was shaking hands at a shopping mall. Steven Howards got in line and when his turn came, he told the vice president that the Bush administration's Iraq policies were "disgusting."

This tweet from Justin Kenney, of the Pew Environment Group, caught our attention:

"This was the first May without a #tornado fatality in US since 2005"

John Weeks discusses the many unusual ways birds construct makeshift nests in the spring. Weeks shares stories of birds using "wildlife ad-libbing" to survive in inhospitable weather.

Perhaps in a effort to widen its reach, Facebook is exploring ways in which to officially open up its services to kids younger than 13.

That's what The Wall Street Journal reported today adding that Facebook is already used by millions of kids who lie about their age.

The Journal reports:

A report by Northeastern University's Center for Labor Market Studies finds that less than 30 percent of U.S. teens had jobs in the summers of 2010 and 2011. Though the employment outlook is bleak, there are some strategies for navigating the summer job market.

A federal judge declared a mistrial in the campaign finance case against former Sen. John Edwards. Since the trial, numerous writers and columnists have considered what we've learned about the former presidential candidate, political campaigns and ourselves through the weeks of uncomfortable testimony.

Syrian President Bashar Assad denied responsibility for the massacre that left more than 100 people dead in Houla in May. Pressure mounts on the Obama administration to consider a more aggressive response to the violence that has plagued Syria for more than a year.