Yale University’s $27.2 billion endowment won’t invest in retail outlets that market and sell assault weapons to the public. Yale’s advisory committee on investor responsibility recommended the ban to a committee of the board of trustees, which adopted the policy recently. The New Haven, Connecticut-based school, the second-richest in the U.S., announced the change in a statement Aug. 21. College endowments are often asked by students to shed their investments in controversial holdings, such as those related to climate change or guns.