For almost twenty years, Cold Spring Harbor Laboratory's DNA Learning Center has provided high quality, engaging online resources for science students. The 3-D Animation Library is no exception. Here, visitors will find a collection of helpful animations that explain a number of DNA and RNA processes. These short videos (each approximately one to four minutes in length) can either be viewed online or downloaded allowing science instructors to easily incorporate them into the classroom. Visitors can browse for videos by categories including Transcription and Translation; Replication; and Disease and Mutation. Each video is accompanied by a full text transcript. These videos help students and other science learners understand a number of concepts and processes that are often hard to visualize.