Watch as Elmo sits in an umpire's chair and debates the two letters found on Federer's On-branded sneakers: Is it 'Q' and 'C' or 'O' and 'N'?

Elmo is turning 3-and-a-half, his age forever and always, since he joined "Sesame Street" in 1980. Of late, he's become a ...

Elmo. Rock City Gardens on top of Lookout Mountain is where the enchantment unfolds abundantly among 14 acres of paths and trails connecting flowers and native plants, giant boulders and rocky ...