Is the glass half empty or half full? Is the glass half empty or half full? "Is the glass half empty or half full?" is a common expression, a proverbial phrase, generally used rhetorically to indicate that a particular situation could be a cause for optimism (half full) or pessimism (half empty), or as a general litmus test to simply determine an individual's worldview. The purpose of the question is to demonstrate that the situation may be seen in different ways depending on one's point of view and that there may be opportunity in the situation as well as trouble. Another perspective comes from psychology, where research has
Marsh test test in Strong Poison to demonstrate that the culprit was secretly in possession of arsenic. In Alan Bradley's "As Chimney Sweepers Come To Dust", 12-year old sleuth and chemistry genius Flavia de Luce uses the Marsh test to determine that arsenic was the murderer's weapon. In the first episode of the 2017 TV series "Taboo" a mirror test, referencing the Marsh test, is used to verify the protagonist's father was killed via arsenic poisoning. However, as the setting of the series is between 1814-1820, a different/earlier process should have been used. Marsh test The Marsh test is a highly sensitive