Year 12 Physics students are currently working on an Atomic and Nuclear Physics standard. As part of this standard, they are learning about radioactive substances and how they decay (turn into other substances). The time it takes half the substance to decay is called its half-life. After one half-life we have half of the original substance still as is and the other half has turned into something different. An example of this is Carbon-14 which turns into Nitrogen and an electron with a half-life of 5,700 years. This means that every 5,700 years, only half the original carbon-14 remains, as the other half has turned into nitrogen. After another 5,700 years, half of that new amount remains... and so on... Students simulated this process- which is random-  using M&Ms. M&Ms facing up represent undecayed atoms and M&Ms facing down represent decayed atoms. Students throw the M&Ms down and record the number of remaining undecayed atoms after each round or half-life, which they then graph. The M&Ms which have decayed can be eaten. They end up with an exponential decay graph and can make predictions based on it.