João Batalha and Luís Batalha are cofounders of Fermat’s Library.Fermat’s Library is a platform for annotating papers. Each week they send out a paper annotated by their community. Some recent papers were Birds and Frogs by Freeman Dyson and Von Neumann's First Computer Program by Donald Knuth.They’ve also built a Chrome Extension call Librarian for the arXiv which allows you to get direct links to references, do BibTeX extraction and make comments on papers.You can find them at FermatsLibrary.com.Read the transcript on our blog.The YC podcast is hosted by Craig Cannon.