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Turbulence is the 
 or unsteady movement of 
. Modern aircraft are designed to survive strong winds and dangerous pockets of air. It is extremely rare for turbulence to damage an airplane. It is even 
 for it to cause a plane to crash. The biggest 
 to passengers comes from not wearing a seat 
. Anyone standing up in the airplane, or not wearing a seat belt while seated, can be thrown around the 
. They can suffer bad injuries by hitting their 
 on overhead lockers or on the plane's 
. Scientists from Reading University in the UK reported that severe turbulence is getting worse because of 
 change. They said 
 increased by 55 per cent between 1979 and 2020.