Measuring any change in dark energy requires creative thinking, which is where the clusters come in.

ECONOMIST: Cosmology

Modern thinking is the enlightenment thinking that ended the Dark Ages and ushered in Newtonian science.

FORBES: The Rabbi's Four Leadership Lessons, Part 2

We lay in bed, in the dark, at night, thinking about all the ways things have changed.

WSJ: Gunman in NY officer's death gets 45 years to life

Foreigners and moneyed local residents who even three or four years ago would have hesitated to hail a taxi in the street or walk around after dark now do both without thinking twice.

NPR: Rape, Kidnap Of Tourists Feed Rio Safety Fears