Problem: According to Walter Gratzer, the study of nutrition probably began during the 6th century BC. In China, the concept of Qi developed, a spirit or "wind" similar to what Western Europeans later called pneuma. Food was classified into "hot" (for example, meats, blood, ginger, and hot spices) and "cold" (green vegetables) in China, India, Malaya, and Persia. Humours developed perhaps first in China alongside qi. Ho the Physician concluded that diseases are caused by deficiencies of elements (Wu Xing: fire, water, earth, wood, and metal), and he classified diseases as well as prescribed diets. About the same time in Italy, Alcmaeon of Croton (a Greek) wrote of the importance of equilibrium between what goes in and what goes out, and warned that imbalance would result disease marked by obesity or emaciation.
In which time period did the study of nutrition begin?
The answer is the following: 6th century BC

Problem: In orthography and typography, letter case (or just case) is the distinction between the letters that are in larger upper case (also capital letters, capitals, caps, large letters, or more formally majuscule, see Terminology) and smaller lower case (also small letters, or more formally minuscule, see Terminology) in the written representation of certain languages. Here is a comparison of the upper and lower case versions of each letter included in the English alphabet (the exact representation will vary according to the font used):
Letter case is used to distinction betweem lowercase and uppercase letter in which common representation of certain languages?
The answer is the following: written

Problem: During the first four days of the war, the general population of the Arab world believed Arab radio station fabrications of imminent Arab victory. On 9 June, Nasser appeared on television to inform Egypt's citizens of their country's defeat. He announced his resignation on television later that day, and ceded all presidential powers to his then-Vice President Zakaria Mohieddin, who had no prior information of this decision and refused to accept the post. Hundreds of thousands of sympathizers poured into the streets in mass demonstrations throughout Egypt and across the Arab world rejecting his resignation, chanting, "We are your soldiers, Gamal!" Nasser retracted his decision the next day.
What did Nasser do after mass demonstrations?
The answer is the following: retracted his decision

Problem: While short-term memory encodes information acoustically, long-term memory encodes it semantically: Baddeley (1966) discovered that, after 20 minutes, test subjects had the most difficulty recalling a collection of words that had similar meanings (e.g. big, large, great, huge) long-term. Another part of long-term memory is episodic memory, "which attempts to capture information such as 'what', 'when' and 'where'". With episodic memory, individuals are able to recall specific events such as birthday parties and weddings.
What is episodic memory?
The answer is the following:
"which attempts to capture information such as 'what', 'when' and 'where'