Transcranial Doppler Assessment of Cerebral Flow Velocity During Cognitive Tasks Roger E. Kelley, MD; Jen Y. Chang, MS; Nancy J. Scheinman, PhD; Bonnie E. Levin, PhD; Robert C. Duncan, PhD; and Shih-Chang Lee, PhD Background and Purpose: The purpose of this study was to assess the ability of transcranial Doppler ultrasonography to detect selective circulatory changes during cognitive activity. Methods: We measured cerebral artery flow velocity in 21 normal volunteers by transcranial Doppler ultrasonography during rest followed by cerebral activation. Mean and peak systolic
Neptune has dark storms and eight named moons, although there are more than 8 moons. Source(s): My memory http://burro.astr.cwru.edu/stu/neptune_m...
Farmers' almanacs published in Maine began calling the third full moon in a season with four a blue moon. Theories abound as to why the publishers did this. Some say that third moon was traditionally called blue in the Czech language, while others think the term comes from the French phrase double moon, la deux lune, which sounds like blue moon. Other theories hold that almanacs started out printing the various types of moons in different colors, while still others assert that those third moons were bad luck, thus rendered blue.