when you get vaccinated you protect both yourself and the people around you if you dont get the flu you cant gift it to your family and friends why you need a flu shot insofar as extraverted children appear to be more at risk for influence by environmental cues there are two different serving extroverted children more likely to be swayed by environmental cues study physical activity was measured in four different ways in the 13 studies using an accelerometer measures motion inperson kids friends may be good influence for exercise scientists had previously converted stem cells into cells of the heart intestine liver nerves and pancreas human stem scientists use human stem cells to make lung tissue