A positive optimist promotes a vision of a better future to motivate people to strive for it. A negative optimist also hopes for a better future but focuses on what keeps us from achieving it.

When one gets into photography, they might think it's as easy as pointing a camera at their subject, pressing a button, and that's it. When they start taking classes, though, they start to see it's a ...

Gram-positive bacteria show blue or purple after Gram-staining in a laboratory test. They have thick cell walls. Gram-negative bacteria show pink or red on staining and have thin walls. They release ...

Bacterial species, and even specific strains can be differentiated using a number of molecular techniques such as PCR, quantitative PCR, genome sequencing and mass spectrometry. But even without ...