Who else to watch: Can you get back to us on this one?
Only one person has won a gold medal at both the Summer Olympics and Winter Olympics.
A female athlete from the United States who was on the track at the 2012 London Games is trying to become the second.
Psst, it's not Lolo Jones.
It's Lauryn Williams, a gold medalist in the 4x100-meter relay and a brakewoman for USA-1 in Tuesday's women's bobsled.
It seems risky to have her in the sled. She's been in the sport for less than a year. She's been paired with Elana Meyers just once. But she is undoubtedly fast out of the blocks.
In their way is the No. 1 sled of Canada piloted by Kaillie Humphries, defending Olympic champ with her 2010 partner Heather Moyse.
"There's definitely pressure for sure. I put the most pressure on myself to repeat that gold medal-winning performance," Humphries said.
Who else to watch: Germany-1 with Sandra Kiriasis at the controls. She might be old (39!) but she knows how to win gold. She won in 2006 at Torino. USA-2 with Jamie Greubel as pilot has fared well during training runs. Russia's top sled is driven by Olga Stulneva, who won a silver medal at the 2004 Summer Olympics in Athens.
Men's freestyle skiing halfpipe
If you thought we were done with debut events, well, my friend, here is another one.
Halfpipe skiing. Or is it ski halfpipe?
Snowboarders have amazed us with their halfpipe skills for five Olympics. Now the skiers get a shot.
David Wise of the United States is one of the top contenders, having won three X Games. He is regarded as one of the most technically precise and stylish skiers in the sport.
He may be pushed by his teammates, including Torin Yater-Wallace, who at 18 is probably too young to let memories of injuries hold him back. He also won an Olympic test event, but that was before there were problems with the halfpipe that snowboarders complained about.
Who else to watch: Kevin Rolland of France, who another skier said did a switch dub 12 in practice. Now that might not mean anything to you but Mike Riddle also said it was something he had never seen landed before. Riddle, of Canada, was a 2011 world champ. Aaron Blunck, 17, won one World Cup event and was second in another.