601.2 Believability of Witnesses [a. General considerations:] Let me speak briefly about witnesses. In evaluating the believability of any witness and the weight you will give the testimony of any witness, you may properly consider the demeanor of the witness while testifying; the frankness or lack of frankness of the witness; the intelligence of the witness; any interest the witness may have in the outcome of the case; the means and opportunity the witness had to know the facts about which the witness testified; the ability of the witness to remember the matters about which the witness testified; and the reasonableness of the testimony of the witness, considered in the light of all the evidence in the case and in the light of your own experience and common sense. [b. Expert witnesses:] [You have heard opinion testimony [on certain technical subjects] from [a person] [persons] referred to as [an] expert witness[es].] [Some of the testimony before you was in the form of opinions about certain technical subjects.] You may accept such opinion testimony, reject it, or give it the weight you think it deserves, considering the knowledge, skill, experience, training, or education of the witness, the reasons given by the witness for the opinion expressed, and all the other evidence in the case.