From the expression Is the glass half empty or half full?, the answer to which is said to determine whether a person is optimistic or pessimistic.
"glass-half-full." YourDictionary, n.d. Web. 21 January 2019. <https://www.yourdictionary.com/glass-half-full>.
glass-half-full. (n.d.). Retrieved January 21st, 2019, from https://www.yourdictionary.com/glass-half-full
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