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.
Freebase(0.00 / 0 votes)Rate this definition: Lui is a French adult entertainment magazine created in November 1963 by Daniel Filipacchi, a fashion photographer turned publisher, Jacques Lanzmann, a jack of all trades turned novelist, and Frank TÃ©not, a press agent, pataphysician and jazz critic..