Students explore the concept of lethal dose (LD50) and research the LD50 for caffeine. Students will then research the amount of caffeine in one of their favorite beverages like Red Bull, Monster, Mountain Dew, coffee, etc and determine how much of their favorite drink could potentially be fatal. Students are asked to provide evidence of research and to show their thinking. Step-by-step procedures are provided or they can be removed to challenge students to create their own research procedures.