In an introductory learning session for Biochemical Communications, students formed a hand-holding chain and timed how long it took for a hand-squeeze-pulse to travel along the entire distance of the chain.

This activity modelled a nerve-transmission signal where we calculated distance/time to figure out the speed of the pulse.  The average speed we calculated was 4.3 meters per second, which fits into published values of nerve impulses to be between 2-120m/s.  A very fun and interactive way to learn about how fast/slow our body communicates with itself!