If found, "it will be the world's eighth wonder, the world's largest statue, " he told BBC News Online.
It's not enough for Google to be the world's biggest search and advertising company.
But Gates didn't get to be the world's richest man by overpaying for shoddy technology.
Nissan said the Leaf hatchback would be the world's first affordable, mass-produced, zero-emission car.
The proposed free-trade area, after all, would be the world's biggest, with some 1.7 billion consumers.
Watch out - Autumn in New York may not be the world's most harmonious love story.
Copenhagen, for example, aims to be the world's first carbon neutral capital by 2025.
It appeared to be the world's deadliest nightclub fire in more than a decade.
The United States may be the world's most powerful democracy but India is its biggest.
The highlight of the 2011 season will be the World Championships in South Korea in August.
The Cannes market has grown to be the world's largest for the buying and selling movie projects.
Only this week, The Economist judged Melbourne, that great over-achiever, to be the world's most liveable city.
Japan's Yone Minagawa, who was born in 1893, is now believed to be the world's oldest person.
Indonesia, self-sufficient in rice a decade ago, will once again be the world's biggest importer this year.
Indonesia, self-sufficient in rice a decade ago, will once again be the world's top importer this year.
As they report this week in Nature, they found what could be the world's oldest surviving life forms.
If cheapening a currency were the way to wealth, Argentina would be the world's most formidable economic power.
Others are private firms, like Gerdau, a steelmaker, or JBS, soon to be the world's biggest meat producer.
ECONOMIST: Now the risk for Latin America��s big success story is hubris
Fed Chairman Ben Bernanke may be the world's leading academic expert on the Fed's mistakes of the 1930s.
The dollar is there, it will continue to be the world's dominant currency.
The measure, introduced a little over a year ago, was believed to be the world's first so-called "fat tax".
After Thursday, it's now a little easier to picture Silicon Valley continuing to be the world-wide center of innovation.
If there is an environmental disaster, he warns, it won't just be China's problem, it will be the world's problem.
He also urged MSPs to encourage the flying of the national flag, which he believed to be the world's oldest.
The new group will be the world's biggest exporter of coal for power plants, and the largest producer of zinc.
In Pass Christian, Miller created what he believes to be the world's largest eagle wood carving, at 25 feet tall.
And the regional stake held by what claims to be the world's top emerging-markets bank is about to grow dramatically.
They researchers looked closely at Brazil's highly controversial Belo Monte dam, said to be the world's third largest hydropower project.
BBC: Rainforest plays critical role in hydropower generation
Some scientists say the Chacaltaya glacier in Bolivia, which used to be the world's highest ski run, has already nearly disappeared.
Magna International ( MGA - news - people )(28, MGA) may be the world's best-run auto parts firm.
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