Free You Are Not So Smart: Why You Have Too Many Friends on Facebook, Why Your Memory Is Mostly Fiction, and 46 Other Ways You're Deluding Yourself by David Mcraney

event of an emergency is often factored into fatality predictions in everything from ship sinkings to stadium evacuations. Disaster movies get it all wrong. When you and others are warned of danger, you don’t evacuate immediately while screaming and flailing your arms.
    In his book Big Weather, tornado chaser Mark Svenvold wrote about how contagious normalcy bias can be . He recalled how people often tried to convince him to chill out while fleeing from impending doom. He said even when tornado warnings were issued, people assumed it was someone else’s problem. Stake-holding peers, he said, would try to shame him into denial so they could remain calm. They didn’t want him deflating their attempts at feeling normal.
    Normalcy bias flows into the brain no matter the scale of the problem. It will appear whether you have days and plenty of warning or are blindsided with only seconds between life and death.
    Imagine you are in a Boeing 747 airplane as it touches down after a long flight. You hide a sigh of relief once the ground ceases to rush closer and you hear the landing gear chirp against the runway. You release the hand rests as the engines power down. You sense the bustle of four hundred people preparing to leave. The tedious process of taxiing to the terminal begins. You play back some of the moments on the giant plane, thinking how it was a pleasant flight with few bumps and nice people all around. You are already collecting your things and getting ready to remove your seat belt. You look out the window and try to make out something familiar in the fog. Without warning, shock waves of heat and pressure tear into your flesh. A terrible blast rattles your organs and tears at all corners of the plane. A noise like two trains colliding under your chin bursts eardrums up and down the aisles. An explosion tunnels through the spaces around you, filling every gap and crevice with streamers of flame surging down the aisles and over your head, under your feet. They recede just as quickly, leaving unbearable heat. Clumps of your hair crumple into ashes. Now all you hear is the crackle of fire.
    Imagine you are sitting on this plane now. The top of the craft is gone and you can see the sky above you. Columns of flame are growing. Holes in the sides of the airliner lead to freedom. How would you react?
    You probably think you would leap to your feet and yell, “Let’s get the hell out of here!” If not this, then you might assume you would coil into a fetal position and freak out. Statistically, neither of these is likely. What you would probably do is far weirder.
    In 1977, on an island in the Canaries called Tenerife, a series of mistakes led to two enormous 747 passenger planes colliding with each other as one attempted takeoff.
    A Pan Am aircraft with 496 people on board was taxiing along the runway in dense fog when a Dutch KLM flight with 248 inside asked to be cleared for takeoff on the same airstrip. The fog was so thick the KLM crew couldn’t see the other airplane, and both were invisible to the control tower. The crew misheard their instructions. Thinking they had just been given permission, they began to speed toward the other plane. Air traffic controllers tried to warn them, but radio interference garbled the messages. Too late, the captain of the KLM flight saw the other craft ahead of him. He pulled up hard, dragging the tail along the ground, but couldn’t take flight. He screamed as half of the KLM aircraft smashed into the Pan Am at 160 miles per hour.
    The KLM airplane bounced off the Pan Am jet, soared for five hundred feet, and then tumbled in a terrible jet fuel explosion. Everyone on board disintegrated. The fire was so intense it would burn until the next day.
    Rescue crews spilled out onto the tarmac, but they didn’t drive out to the Pan Am flight. Instead, they rushed to the flaming wreckage of the KLM plane. For twenty minutes, in the chaos, firefighters and emergency personnel thought they were