Why aren't Mountain streams as curvy rivers in the open plains?

Is there any solid scientific evidence that humans have been cloned?

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.

The dense layer of connective tissue that surrounds an entire skeletal muscle is the