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.

Negative thinking considers the weaknesses of human nature, the disadvantages of change, and how things can go wrong. Positive thinking considers the goodness of people, the advantages of change, and ...

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 ...