Caffeine plays a huge role in today's society, from coffee to colas to candy bars. Companies have made billions from wanting that extra push. Caffeine is the most consumed behavioral active substance in the world, making it one of the most popular drugs in the world. It is known for its ability to stimulate the brain and central nervous system. The chemical structure of caffeine is C8H10N4O2. Before the popular use of caffeine it can be assumed that people were more drowsy and less alert. Consuming 1000-1500 mg per day is associated with a condition known as caffeineism. Caffeineism usually combines caffeine dependence with a wide range of unpleasant physical and mental conditions including nervousness, irritability, restlessness, insomnia, headaches, and heart palpitations after caffeine use. Caffeine blocks the neurotransmitter adenosine, which acts as an inhibitor of other neurotransmitters. “When adenosine flows normally through the brain, it slows the brain and body… When adenosine is blocked, the brain and body become more alert and active (Marcovitz 33).” Caffeine contained in coffee or other beverages is absorbed by the small intestine within 45 minutes of ingestion and then distributed throughout the body's tissues. The maximum concentration in the blood is reached within an hour. The biological half-life of caffeine, or the time it takes for the body to eliminate half of the total amount of caffeine, varies widely between individuals based on factors such as age, liver function, pregnancy, certain concomitant medications, and enzyme level in the blood. the liver necessary for the metabolism of caffeine. It can also be significantly altered by drugs or hormonal states. In healthy adults, the half-life of caffeine has been measured with a ra... paper medium... natural pesticide and an inhibitor of seed germination of other nearby coffee plants, thus giving it a better chance of survival. Caffeine has also been found to improve bees' reward memory, improving the plant's reproductive success. People are continually innovating new ways to use caffeine. For example, two Harvard undergraduates are working on a new product called Energy Spray. This new idea means you don't need to drink a coffee or energy drink to get the caffeine you need to wake up. They decided to create something that you can spray on your skin and it will be absorbed into your body. Containing water, caffeine and amino acids, this should not give you the caffeine rush, but give you a natural feeling of being more awake. Caffeine has shaped everything from office work to physical labor. Who knows what the world would be like without it.