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A lab in Chicago can produce particles called muons, but it needs an electromagnetic ring on Long Island to produce them. Since the 50-foot ring can't be taken apart or flown over houses, movers drove it to the shoreline and will sail it down the East Coast on a sea barge and up rivers to the Windy City.

The Obama administration announced Tuesday that it's delaying a key part of the Affordable Care Act. Businesses will now have another year to prove that they are providing health insurance — or that their employees otherwise have health insurance from some other source. Companies had complained that the reporting requirements to prove this were too complicated and burdensome.

David Green says capitalism practiced with empathy is the right way to make health care available to the masses. The social entrepreneur is working on medical devices and services that can make a difference in the developing world.

Small-scale protests are continuing in Brazil but the massive movement has died down as quickly as it flared up. One of the reasons is protest confusion. The perils of having no leadership are that people don't know what protests are real.

There has been a shift in recent week and global investors have been pulling their money from emerging markets. To find out the reason, Renee Montagne talks to David Wessel, economics editor for The Wall Street Journal.

The 48-hour deadline Egypt's army imposed on the president to compromise with his opponents or face a military roadmap ends on Wednesday. Egypt's generals have said they will impose their own road map for ending the unrest if President Morsi can't or won't.

Military chief Gen. Abdel-Fattah al-Sisi says that Mohammed Morsi is out as president and the country's constitution has been suspended. Egypt's chief justice will hold power during the transitional period and set a date for early presidential elections.

In 2011, California listed 4-MEI, the chemical that Coke and Pepsi used to obtain caramel coloring for their colas, as a carcinogen. Both sodas have been reformulated for sale in the state — but tests show 4-MEI is still common in Pepsi colas sold elsewhere.

The American health system is well-suited to fixing acute problems. But chronic issues, such as diabetes and obesity, have proved challenging. Prevention could reduce the risks, yet the approach hasn't taken hold. Here's a leading medical thinker's take on why, and how to fix things.

In a rebroadcast from October 18, 2009, Keith & Russ talk with Dieter Cremer, professor of Computational & Theoretical Chemistry at Southern Methodist…