Olympic viewers want to see world records. It's why NBC shows the world-record-pace line during swimming telecasts, and it's constantly part of the conversation during track and field.
Both sports have a handful of competitors with a chance to break a world record over the next few weeks in Rio de Janeiro, mostly on the women's side.
This cheat sheet will help you witness history in Brazil. Let's take a look at the records in jeopardy during the 2016 Summer Games.
Note: All event final times are Eastern. You can view the full Olympic schedule on the event's official website.