Newsletter Number 69 includes The Chairman's Notebook, Lab Notes: Undergraduate Research - A Perspective by Frank DiSalvo, Chemical helps ants remember where they left their food, shows promise for Alzheimer's disease; Cornell scientists report excited ants follow pheromone trail of same chemical they will use to paralyze their prey; Wild tomatoes yield formula for nontoxic insect repellent, Cornell researchers say; U.S. patent granted to 'Non-cyclic Esters for Pest Control"; Faculty News, Department News, and News from Alumni and Friends