As summer approaches and temperatures begin to rise, it’s important to take steps to keep cool. Excessive heat can be incapacitating, and the effects might not hit you until you have already taken off. A Ryan Air pilot found this out the hard way as he passed out partway into a flight from Pisa, Italy, to Las Palmas, Spain, on July 6, 2011. The captain had to make an emergency landing, and a subsequent investigation concluded that the copilot had fainted as a result of excessive heat. The pilot had walked to the airport in Pisa during hot, sunny conditions right before the flight departed.