There are those among us who don’t truly feel alive unless their blood is pulsating through their veins, accelerated by the incessant beat of a heart racing with adrenaline. They spend their lives chasing that natural high, each for their own aim. Some like the rush, others need to push themselves to reach new challenges to feel complete. Whatever their reason, they have found something that gives them that necessary feeling of elation, whether it’s jumping from airplanes, swimming with sharks or racing automobiles. It may not be for everyone, but for these neighbors, the more extreme the better.