The new lights use 60 percent less energy than the old lights and require no bulb replacements for about six years, according to DePaul. DePaul couldn't provide the cost of the change, but the university expects to make back its investment in three years. The lights are also supposed to provide more uniform light and increase visibility.

The lights are a product of EvoLucia, the lighting division of Sunovia Energy in Sarasota, Florida.

The answer is the rear-end collision involving a Chicago Rapid Transit elevated train and a Chicago, North Shore & Milwaukee interurban train at Granville station on Nov. 24, 1936. A northbound el train of eight wooden and steel cars was stopped, waiting for clearance onto a local track, when the North Shore express, made up of three steel cars, slammed into it from behind at just 10 mph. Federal investigators attributed the number of casualties to the fact that the steel coaches telescoped through the wooden rear coach of the El train, destroying it.

Carl Rollberg at Calumet Park got in his answer at 6 a.m. -- and was the winner!

At least one mayoral candidate has come forward on this issue -- City Clerk Miguel del Valle. On his campaign-focused Facebook page, Del Valle said he wanted to make Chicago "one of the most bicycle friendly cities in the world."

"Let's make Chicago one of the most bicycle friendly cities in the world," del Valle wrote. "Let's add bike lanes. Let's ensure quality pavement..." del Valle wrote. "I will work with the City Council, the Chicago Department of Transportation, and the Active Transportation Alliance to launch bicycle friendly initiatives. Let's keep this going."

Del Valle says his son is an active cyclist.

The answer is Honore, named for Chicago real estate developer Henry Hamilton Honore. His daugher, Bertha, married Potter Palmer of Palmer House fame.

Janet Heifetz of Chicago was the first with the right answer, and she gets the umbrella.

The answer is Cornelia, whose grandfather was subdivider Walter S. Gurnee. Gurnee was mayor from 1851 to 1853.

No one got this answer -- but we had some good guesses. Ada, like Cornelia, was named for the granddaughter of a subdivider. Berenice was named for a subdivider's daughter. But neither of those men became mayor.

A subdivider, if you're wondering, is someone who divides land into building sites.

The answer is the streets of Belfast, Northern Ireland. Walter Brzeski of Chicago was the first with the right answer.

The answer is the drive-in movie theater. Susan Flynn of Hickory Hills was the first with the right answer.

I do own a car -- a fully paid-off car. I ride a bike a couple of times a week because I need the exercise. But in reading the frequently heated comments after bike articles, I always run into this notion -- that people are on bikes because they can't afford cars, not because they like bikes. This seems to be a delusion sustained by Hollywood, according to this article by transportation writer Tom Vanderbilt. He cites all the movie losers who don't drive, like the Ben Stiller character in "Greenberg" or Steve Carell's bicycling 40-year-old virgin. He wonders if this is because screenwriters live in Los Angeles, the car-culture capital.

He also wonders if this approach to non-car transportation is changing -- the comedy "500 Days of Summer" has a California couple actually taking a train to a San Diego wedding. But I think Vanderbilt is forgetting some of the cool film depictions of bicycles from the past -- like "Breaking Away" or "Butch Cassidy and the Sundance Kid," or train movies like "North by Northwest." No one called Cary Grant a loser for riding the rails.

The line was built for the 1893 World's Fair, and torn down when the fair was over. Len Marcus was the first with the right answer. If Len can send me his mailing address, I can send him his prize.