Jenn and Emily, members of the Junior United States Luge Team, slip slide away at the New York Hall of Science playground, investigating gravity and then applying what they learn to maximize their timings on the icy tracks at Lake Placid. Stanley and Jessica go ape, checking out the Bronx Zoo's Congo Gorilla Forest to see how plants and animals coexist in the many layers of the African Rainforest. And find out what's not so natural about New York's Central Park-the most frequently visited urban park in the U.S.