I am trying to do some writing and as English is a foreign language I would like some help in writing. I want to write something of stars and my plan goes something like this: Basically I like to say that although historically stars seemed to show no variations, growing evidence showed lot of stars do show variations and want to give some examples. I'd like some examples on how I can get to introduce this topic. My topic is on the use of stellar variations to infer their structure and dynamics. Then say that the variations have been observed both on stars and the Sun from both land based and space based instruments.