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Linda Wertheimer and Steve Inskeep have business news.

Steve Inskeep has the Last Word in business.

Concluding that he can win the Iowa caucuses, former Massachusetts Governor Mitt Romney spent the weekend campaigning in western Iowa, a mostly conservative region. After months of making only periodic visits to the state, Romney is making an aggressive final push through Iowa.

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LINDA WERTHEIMER, HOST:

Newt Gingrich says, when it comes to his campaigning, he has been conducting an experiment. The former House speaker says he's been running a positive campaign as he competes for the Republican nomination. And if voters who say they hate negative campaigning practice what they preach, Gingrich says he'll do better than expected in Iowa.

STEVE INSKEEP, HOST:

But Gingrich also says he needs to set the record straight, and that means firing back at Mitt Romney.

For generations of Japanese, smoking has been all but synonymous with manhood and hard work. During Japan's high-growth period in the 1960s, the smoking rate for males topped 80 percent, twice as high as the rate during America's smoking heyday.

In a country that's so tobacco friendly, it's no wonder anti-smoking initiatives have trouble gaining traction. That's despite the estimated $90 billion being spent on cigarette-related health costs and damages every year, three times what cigarette sales bring in annually, according to the Japan Health Economics Association.

Chinese leaders made a rare condolence visit to North Korea's embassy in Beijing last month.

Broadcast on China Central Television, the leaders – dressed in black suits — bowed in unison towards the portrait of Kim Jong Il. Why show so much respect to a man who had so much misery?

One reason: fear of something worse.

Companies making genetically modified animals face a regulatory morass in this country. It's not always clear which federal agency has responsibility for regulating a particular animal, and even when one agency does take the lead, the approval process can drag on for years.

The companies say this uncertainty means their technologies may die without ever being given a chance.

Take the case of the British company Oxitec. It has developed a genetically modified mosquito that the company says can be used to combat a disease called dengue.