Do you use the Oxford Comma? Also known as the serial or Harvard comma, it is added after before the last conjunction in a series of three or more items.
"I thank my parents, Ayn Rand, and God" versus "I thank my parents, Ayn Rand and God". Proponents argue that not only is the latter absurd, Ayn Rand would have rejected such a collaborative arrangement with God of all people ;)
Whatever your thoughts on this, I do hope you don't use a double space after a period?