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 word qi may be little, but boy is it energetic. In fact, qi stands for the energy in everything. (It's also a handy word to know in Scrabble.) In Chinese philosophy, qi, also spelled chior châi, is the life force that every person and thing has. Chinese medicine and acupuncture both address the concept of qi; if youâre feeling a little under the weather, an unbalanced qi may be the culprit.