NBC Nightly News with Brian Williams

What exactly is an Olympic gold medal made out of?

Photo: Dominic Ebenbichler/Reuters

Tonight on Nightly News: Meet Olympic Gold Medalist Missy Franklin

Police lose keys at major Olympic venue »

Olympic flame makes final leg of epic journey before tonight’s Opening Ceremony

Photo: Ben Birchall/LOCOG via AP

Greek athlete expelled from Olympics over comments on Twitter

Photo: Reuters

BREAKING: Rafael Nadal has withdrawn from London Olympics, says he’s “not in condition” to compete.

Story via NBC Olympics

Coming up tonight: Lolo Jones has overcome some of life’s biggest hurdles and has represented the U.S. on the Olympic track. Tonight, the first look inside her high-tech training.

Countdown to the Olympics in Times Square. 100 days to go!