At the core of biology and other sciences lies a problem-solving approach called the scientific method. 1  Make an observation. 2  Ask a question. 3  Form a hypothesis, or testable explanation. 4  Make a prediction based on the hypothesis.  Test the prediction.
Xi. Xi is the 14th letter of the Greek alphabet. It is pronounced in Modern Greek, and generally or in English. In the system of Greek numerals, it has a value of 60. Xi was derived from the Phoenician letter samekh. Xi is not to be confused with the letter chi, which gave its form to the Latin letter X.
The wu in wuxia refers to martial arts or combat. The xia refers to a person whose sense of righteousness is so profound that it empowers them to sacrifice themselves and even break the law to help people. The closest equivalents in English would be the hero, knight, warrior, or vigilante in superhero comics.