Rosalind is an educational resource and web project for learning bioinformatics through problem solving and computer programming. Rosalind users learn bioinformatics concepts through a problem tree that builds up biological, algorithmic, and programming knowledge concurrently or learn by topics, with the topic of Alignment, Combinatorics, Computational Mass Spectrometry, Heredity, Population Dynamics and so on. Each problem is checked automatically, allowing for the project to also be used for automated homework testing in existing classes.