The human need around you will be immense— greater than any world war it will be. And you will have to be prepared to take care of people, people you do not even know perhaps, and to assist others in ways that will be new for you and unexpected. There will be great shortages of food and in some places great shortages of water. Your energy resources will become precious, difficult and expensive to gain access to. There will be political and economic instability, and there will be much civil unrest in many places in the world. – The Great Waves of Change
GPIO pins have no predefined purpose, and go unused by default.   The idea is that sometimes a system integrator who is building a full system might need a handful of additional digital control lines—and having these available from a chip avoids having to arrange additional circuitry to provide them. For example, the Realtek ALC260 chips ( audio codec ) have 8 GPIO pins, which go unused by default. Some system integrators ( Acer Inc. laptops) use the first GPIO (GPIO0) on the ALC260 to turn on the amplifier for the laptop's internal speakers and external headphone jack .