This year, to help keep my students' brains a little more engaged, I've posted a "Did You Know" comment on a small white board by the front door every day. It's up to the students to look at the board and remember what the fact was. At the end of the week, I will choose a random student to see if she remembers the fact. If she gets it, then she gets this little postcard with a note written to her parents and Smartie Candy.
This just a fun thing to keep students motivated and interested in their learning.
I've included cards that say "day" and "week" - depending on how you want to implement it into your classroom.