For those who don't wish to invest the time Williams shows how "slavery" is a poor translation choice given how Westerners think of slavery, even though slave is increasingly used in modern translations. A helpful chart (reproduced below) from 22:31 minutes compares the rights of slaves (bondservants) in the Old Testament with Roman slaves and American slaves. He also introduces a very helpful interpretive point on Exodus 21:21 (from 25:40 minutes).
Does the Bible Support Slavery? by Peter Williams
Hat tip: Mark Ward, Andrew Wilson.