Yeah massive agree. Its in our genetic make up to improve and progress and in this day and age, as it suggests in the article up top, the only way we can really do that anymore is by sending it HUGE and it takes a certain individual with the right mind set/addictive personality/someone who genetically loves the reward drug (dopamine) to do that. Your body releases dopamine primarily as a survival technique. When the out come of a decision (for example buying a coke at a vending machine, and two drop out the bottom) gives a greater reward than expected dopamine is released. This gears the body up to remember why that was good because at the moment in time you feel amazing. For some reason the same thing happens with adrenaline and dopamine when doing something gnarly.