Secret Weapon Buoys Nyad's Final Cuba-Fla. Swim

American endurance swimmer Diana Nyad is "doing remarkably well" in her fifth attempt in 35 years to become the first person to successfully swim 103 miles from Cuba to Florida without a shark cage. She made it through the first night without any of the jellyfish stings that have doomed her previous efforts, and as CNN notes, she has a secret weapon for this, her final attempt: A prosthetic face mask that will block the stings. "This is the first time we've ever reached international waters without a crisis," says a member of Nyad's team.

"It's a two-edged sword for me," the 64-year-old Nyad has said of the mask. "It's cumbersome, it's difficult to swim with, but it doesn't matter. I am safe. There's no other way." Nyad has expressed some fatigue, notes the AP, but is stroking well. She's been in the water since 9am yesterday; the journey is expected to take 80 hours if she completes it. Team Nyad is blogging her adventure here. (More Diana Nyad stories.)