The free lunch provided by Moore’s Law is running out. Still, customers want more computing power, more performance. Parallelism (especially on GPUs) offers a way for software developers to deliver more. This talk offers an intro to parallelism on the Raspberry Pi with open source tools like Python. Finally, the presenter will show how the skills one uses to write parallel code on the Raspberry Pi can be adapted to GPUs. Stated another way: Raspberry Pi is a gateway drug for GPUs.