I was surprised to see in Science News, conclusions about causation made on the basis of correlational research. The variance in activity levels may have been a consequence of differing levels of energy among the participants at the outset of the study, perhaps due to differences in general health. We should be careful about this victim-blaming habit.
Joan Sophie Chicago, Ill.
Log in
Subscribers, enter your e-mail address for full access to the Science News archives and digital editions.