Lesson Summary Students quantify response time in 100ths of a second.  They catch a falling strip of paper on which are written numbers that correspond to the time elapsed between drop and catch. Teacher Background Coordinated humans generally respond to visual stimuli in less than a quarter of a second.  Timing in 100ths of a second is used in many types of racing, including swimming, speed skating, and skiing. Set-up/Management Tips Teacher needs to be aware of any students with disabilities and how to accommodate for those disabilities. Have numbered measurement strips copied and ready for lesson. Copy any journal sheets needed for this activity. Literacy Support Books Available Through VAST Mediagraphies: (see Literacy Links) Science Stories The Circulatory System Scientific Vocabulary The following words are key vocabulary words that will be introduced in this lesson and reinforced throughout the unit: No new vocabulary.