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Koenigsegg's craziest supercar yet debuts at Geneva

Here's what you need to know about the Koenigsegg One:1. It weighs 1,360 kilograms; it produces 1,360 hp. One horsepower per kilogram, which is why mad scientist Christian Von Koenigsegg is absolutely justified in bragging about it: it's the world's first "mega car," he said.

Who's where: Jean-Arthur Madelaine-Advenier becomes Citroën's head of interior design

Citroën has appointed Jean-Arthur Madelaine-Advenier as its new head of interior design. The 34-year-old Frenchman joins the firm from Tesla, where he had a brief stint as lead designer for interiors at the US-company's California studio. Madelaine-Advenier graduated from the RCA in London in 2003, then headed to Mercedes' advanced studio in Italy for a three-year stint as a junior interior designer.

Auction of Jay Leno tractor to benefit veterans

Bidders at the Barrett-Jackson auction in Scottsdale, Ariz., this week have a chance to buy a vehicle being retired from entertainer Jay Leno's garage and support a charity that serves military families. The vehicle is a New Holland Boomer tractor. For the past five years, the staff at Leno's garage has used the "Lil Tug" to move the TV host's large collection of classic and unique cars around the facility.