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PHOTOS: Can Love Survive a 20,000-Mile Journey?

To find out, he came up with a radical idea: The two would take the road trip of a lifetime and put their young love to an ultimate test. He and his new bride would tackle the world's longest road -- the Pan American Highway, a 29,800-mile trek from Alaska to Argentina -- while riding on a motorcycle with a sidecar.

The London couple quit their advertising jobs and planned for a nine-month journey through 16 countries.

"It was really scary," Alanna Clear admitted.

Before venturing out, they decided to see how deep their love was for each other, and whether their wild adventure would change it over time. The two contacted world-renowned anthropologist Helen Fisher to have their brains scanned.

Mike Clear had read about Fisher in the newspaper, and he got in touch with her on the off chance that she would do her compatibility test on them. But Fisher suggested the two have their brains scanned instead.