Cyclist Lael Wilcox Eyes World Record With 18,000-Mile Ride

After smashing the women's around-the-world cycling record by two weeks, Alaskan ultra-cyclist Lael Wilcox is returning to break the overall human record of 78 days.

She'll pedal 18,000 miles across seven continents starting June 7, proving women can compete with men in the most extreme endurance challenges.