Why Are They Waiting?

medicinal plants and antioxidants: why they are not always beneficial?

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Why are arteries the size they are?

SONES AND SHIREY (12) PERFORMED the first coronary artery angiogram by accident in 1958. While injecting contrast material for a left ventricular angiogram, the catheter slipped out of the ventricle and into the right coronary artery. Sones immediately recognized the advantage of visualizing the coronary artery lumen, and coronary angiography quickly developed (3, 12). Coronary angiography prov...

Exposure data. Why are they needed?

Aspects of different approaches to study design in the epidemiology of sports injuries are presented, identifying 4 major types: (i) the clinical case series; (ii) the community-based survey; (iii) studies on specific sports or diagnoses without exposure data; and (iv) studies on specific sports or diagnoses with exposure data. The advantages and disadvantages of these concepts are discussed. I...

Observational studies: why are they so important?

Soft quasicrystals – Why are they stable ?

In the last two years we have witnessed the exciting experimental discovery of soft matter with nontrivial quasiperiodic long-range order – a new form of matter termed a soft quasicrystal. Two groups have independently discovered such order in soft matter: Zeng et al. in a system of dendrimer liquid crystals; and Takano et al. in a system of ABC star-shaped polymers. These newly discovered soft...