Researching focused information effectively is searching the 5Ws about your topic (who, what, when, where, and how) fulfills your topic with important information and reduces your time by searching the 5Ws. Also, while asking information that people often ask about the topic and finding answers can settle your information- that your information is valid (that lessens the audience to ask the most asked question of your topic as the most asked questions is included in your powerpoint (or any device that you use to present your topic)
B. to insert at intervals.
Intersperse is a verb, and it's dictionary meaning is: "<span>scatter among or between other things; place here and there."
ie, "the conversation was interspersed with silences".</span>