Today, bacteria are in the limelight as we discover how bacteria could help solve crimes and how coffee can help boost beneficial gut bacteria. On This Day in History, we go underground for the construction of the Chicago freight tunnels.

Can Bacteria Solve Crimes? The "Sexome" Could Help Catch Sexual Predators | ZME Science

Coffee Boosts Beneficial Gut Bacterium | Scientific American

Chicago's Freight Tunnels - Under Your Feet - The University of Chicago Library

Chicago's Forgotten Underground Freight Tunnels - Chicago Detours

Chicago Freight Tunnels - Atlas Obscura

Frederic Delaitre's Lost Subways / Chicago Freight Subway

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