a measure of relatedness between two antigenic substances
This is the first book I've read by Connie Willis and I understand now why my science-fiction-loving friends keep recommending her to me. I had several other books in process when I brought this one home, but once I read the opening chapters it was impossible to leave it alone. An utterly absorbing, heartbreaking tale of a young Oxford historian who travels back to medieval England and mistakenly ends up in 1348 during the outbreak of the Black Plague. It's a really good read and the kind of book you can't help thinking about long after you've finished it.