As the impeachment inquiry goes into a new stage, a look at constitutional law. A move to delay Chicago sales of recreational marijuana. And repurposing coffee waste on a grand scale.

• Constitutional Questions Debated in Testy New Phase of Impeachment
• African American Aldermen Try to Halt Sale of Legal Pot in Chicago
• Crain’s Headlines: Whistleblower Suit Claims Navistar ‘Wildly’ Inflated Prices
• Bears vs. Cowboys Preview: Chicago Hopes to Gain Ground in Playoff Picture