It's always a good idea to boldly take a notebook with you while going where no person has gone before.
The Star Trek Captain's Log not only has 48 pages for jotting down notes, it also is filled with useful information. Forgotten the Prime Directive? You will find it right there on the inside cover. Can't remember the warp speed to average speed conversion rates? Check the back inside cover. Need a refresher on the Early Federation Timeline? This notebook has that too. This handy dandy notebook is the perfect companion for traveling through space, and sometimes time.