Welcome to Law.com Class Actions: Critical Mass, a weekly briefing for class action and mass tort attorneys.

This week: Paul Clement told the U.S. Seventh Circuit on Monday that bankrupt 3M unit Aearo has a “straightforward case for reversal.” Juul has agreed to settle thousands of lawsuits over its e-cigarettes, with some reports estimating total payouts of $1.7 billion. Find out who the lawyers are representing L’Oreal and other hair relaxer brands in cancer lawsuits.