Our popular science IM reference service will be unavailable tomorrow, Friday, October 23. Normal hours will be restored next week: Monday-Friday 10:00-12:00 and 1:00-5:00.

The collaborative 24/7 Ask a Librarian service will still be available. Ask a Librarian is a chat reference service that connects you to a librarian and emails you a transcript of your chat so you can reference it later.