January 17 marked the 112th anniversary of the reversal of the Chicago River. Debra Shore, Metropolitan Water Reclamation District Commissioner, shared this photo of Lawrence Avenue along the North Branch in 1909. Credit: The Lost Panoramas: When Chicago Changed Its River and the Land Beyond (CityFiles Press)

The Lincoln Square Christmas Tree. Credit: Sarah Tilotta

A Chicago firefighter quickly opens and closes a street hydrant this morning. Area fire crews are flushing the hydrants to check their pressure in preparation for winter. Credit: Mike Fourcher

Teachers, parents and students gather at Waters Elementary School this morning. Regular schedule public school started with a full class schedule today. Many area Catholic schools started class last week. Credit: Mike Fourcher

Sweater weather already? An unidentified yarn bomber, the latest trend in urban street art, knit a comfy cape for one of Lincoln Square's best-known residents. His female companion also boasted a garland of wool flowers in her hair, which mysteriously disappeared. Photo by Patty Wetli.

ComEd trucks responding to power outages in Northcenter following last week's storms. Credit: Flickr/Mark 2400.

Credit: Flickr/Such_Luck.

Photo by Flickr user ajdoudt.

Photo by Flickr user -Tripp-.

Karl Klockars took this photo March 29.

Photo taken by Flickr user chloeloe

Photo by Flickr user vxla.

Photo by Flickr user Nniemiac2000.

Voters line up for their ballots at polling place at the Builder's Center Chicago, 2001 W. Irving Park Rd. Credit: Mike Fourcher.

Photo by Flickr user spudart.