Gasp! My fourth grade teacher might've been right after all - chewing gum in class may actually be bad for you:
... scientists at Cardiff University in Wales now find chewing gum can impair classic tests of short-term memory — recalling lists of words and numbers in the order in which they were seen or heard. They also saw that people were less able to spot missing items in lists — for instance, that '7' was missing the list '28149365' taken from the digit set 1 to 9.
Link (Photo: Shutterstock) | The study by Michail D. Kozlov, et al.