E-cigarettes: Are they safe? Do they help to quit real cigarettes? Or do they lure children to take up smoking? There are new studies from 2013. Unfortunately, even with the new data, we cannot draw firm conclusions. We need more independent research into e-cigarettes.

The bacteria that live within us: No study shows proof, but they show association, and those associations are fascinating. Someday we might prevent and/or treat diseases just by manipulating our bacteria. We might be witnessing the birth of a revolution in medicine.