Polymath Jr. is offering a remote collaborative mathematical research opportunity for undergraduate students this summer. The program consists of research projects on a wide variety of mathematics topics. Each project is guided by an active researcher with experience in undergraduate mentoring. All undergraduates who have experience with writing mathematical proofs are eligible. There are no citizenship restrictions and the participants could be anywhere in the world. However, online meetings are likely to follow US hours. The program runs from June 21-August 15, 2021. Application deadline is April 1 and submitted through mathprograms.org.