Telling Time Bingo Game (to the hour and half hour). This game would be a fun and easy way to work on telling time. Telling time is a large math concept that comes in first grade and this activity would help make it more enjoyable for the first graders.
Phylogenetic Tree of Life -The OpenLearn site used to offer this phylogenetic chart in the shape of a tree as a free poster, but no more. They do have an online version of this same illustration, expandable and with links and an explanatory guide.