CEO Brian Niccol’s goal to restore some of the coffee chain’s former homey feel includes baristas adding upbeat greetings and drawings on takeout cups. But the company just set some limits.

Arnold Mathijssen, a physicist at the University of Pennsylvania, is partial to pour-over coffee, which involves manually pouring hot water over ground beans and filtering it into a pot or mug below.

July arabica coffee (KCN25) today is up +12.00 (+3.22%), and May ICE robusta coffee (RMK25) is up +55 (+1.05%). Coffee prices ...