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Some people are 
, while others remember 
. Scientists know how the brain remembers 
. There is little research on 
 it forgets things. Researchers in the USA studied how the 
 forgets. The research may help 
 with memory 
. It may also help people who have 
 and dementia. A researcher said: "It may sound 
 that people can control 
 and how they forget."