Pubblicato in Sauropod Vertebra Picture of the Week

The best open-access publishers make their articles open from the get-go, and leave them that way forever. (That’s part of what makes them best.) But it’s not unusual to find articles which either start out free to access, then go behind a paywall; or that start out paywalled but are later released; or that live behind a paywall but peek out for a limited period. Let’s talk about these.