In addition, the strength of each recommendation was classified as either strong or conditional
Here's a gorgeous figure (from that shows the structure of a neutron star: Yes, you may say, that's all very well for keeping nuclear theorists employed, but how can we possibly tell if it works out in reality
Tobacco-Induced Diseases , 18, 60
Available in Red, Blue, Green
The paper tears when you try to roll it Either the paper is too thin for where you are in the learning curve, or you are applying too much friction with dry fingers
Some researchers claim that more prolonged exposure to smoke (e.g., 40 years, a half pack per day) poses a higher risk than shorter periods (10 years with two packs per day) even though the number of pack years is the same in both cases