This week's Minerva Distinguished Visitor Lecture will be "Rational curves in quiver varieties." Andrei Okouknov will deliver the lecture Friday, May 2nd, from 4:30 p.m. to 6 p.m. in Fine Hall 314. For videos of previous lectures, see We will first review the general structural features of quantum multiplication and then discuss the key points that allow to determine it for Nakajima varieties.