Which type of water is more dense: cold, salty water or warm, less salty water? explain your answer

Which of these statements are true about scientific theories and hypothesis

Which of the following is an advantage of solar energy?

In an experiment examining the effects tai chi on arthritis pain, callahan (2010) selected a large sample of individuals with doctor-diagnosed arthritis. half of the participants immediately began a tai chi course and the other half (the control group) waited 8 weeks before beginning. at the end of 8 weeks, the individuals who had experienced tai chi had less arthritis pain that those who had not participated in the course.