A break down of who buys and what exactly sells at the U.S. Treasury bond auctions.

The Dow Jones Industrial Average crossed over into record territory Tuesday morning and kept going. At midday it was up nearly 150 points and well over its previous high of 14,164, set in October of 2007. The composition of the Dow has changed a lot since then.

When former Florida Gov. Jeb Bush got to work on his new book on immigration, he was expected to be out in front of his party urging a broader conversation with Hispanics and more open legislation. After all, he had previously supported a pathway to citizenship for immigrants here illegally. Instead, it's fellow Florida Republican Marco Rubio in the lead, and Bush who's explaining an apparent reversal on the issue of citizenship. Both are likely candidates for president in 2016.

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AUDIE CORNISH, HOST:

Joining us now to talk about what comes next is NPR's Tom Gjelten. He's covered Latin America for us.

And, Tom, Hugo Chavez, such a dominating figure in Venezuela. What happens now in the immediate aftermath of his death?

Federal stimulus money has helped cut the high cost of lithium-ion batteries, but not nearly enough to make electric cars affordable. Now there's an abundance of advanced battery manufacturers and not enough major companies to buy them. Many plants in the United States, South Korean, Japan and China that got government subsidies aren't producing many batteries, if at all. Three years ago Michigan's governor touted the state as the new battery capital of the world. There were five new advanced battery plants in the works, all of which were to get major tax breaks and some federal grants.

Lithium-ion batteries sparked a crisis for Boeing's Dreamliner 787 — but the crisis is not an unprecedented one. Four decades ago, a very similar transition to new battery technology in airplanes yielded similar problems. Audie Cornish describes what happened then — and what lessons might be learned as lithium-ion batteries become the next generation that power planes.

Twelve former members of the Florida A&M marching band are charged in the hazing death of drum major Robert Champion. The charges have now been upgraded to manslaughter. Champion's parents said Tuesday that they are encouraged by the stiffer charges.

With the rise in superbug occurrences at hospitals, Audie Cornish talks with Tara Palmore, deputy hospital epidemiologist and infectious disease physician at the National Institutes of Health, about how healthcare facilities are changing practices to help stem the spread of the drug-resistant bacteria.

Forest elephants in central Africa are being slaughtered in record numbers. The most comprehensive study ever, done over a decade, shows that poaching — mostly for the Asian market for ivory — has put the forest elephant on the brink of extinction. Poaching has overcome laws and treaties to protect the species. The U.S. government and wildlife groups are struggling to slow the killing. A meeting in March of the Convention on International Trade in Endangered Species will focus on solutions. Audie Cornish talks to Christopher Joyce.

Some Syrians living comfortably in the U.S. are understandably wracked with guilt that they can't do more to help their countrymen. Each has his own way of dealing with the situation. But now that the liberated north is easier to reach, they're starting to come back and many of them visiting parts of the country they've never seen before. We profile a Syrian-American gun enthusiast who's doing his part to arm and train the rebels.