Red bull and Daphnia
Red Bull increases the heartbeat rate of Daphnia.
Red Bull is a very popular energy drink that is consumed all across the world. It is believed that the ingredients that are used to manufacture this drink were taken from a popular Thai energy drink called "Krating Daeng". Some of the ingredients found in this drink apparently include taurine, caffeine, sucrose, glucose, vitamin B, glucuronolactone and phenylalanine. (source: http://en.wikipedia.org/wiki/Red_Bull)
Red Bull manufacturers claim that the energy drink can help to increase an individual’s performance, concentration, reaction time, vigilance and also improve their emotional condition.
Daphnia are tiny aquatic crustaceans also known as "water fleas". They are normally about 0.2 mm to 5.0 mm in length. They normally live in swamps, lakes, streams, rivers and ponds. Their translucent bodies make them suitable for science experiments. The Daphnia’s heartbeat can be directly observed and counted under a microscope.
Handle all laboratory equipment carefully, wearing safety gear/gloves.