Additionally, it makes a complex topic simple to understand providing different opinion and perspective.
Ask questions like "how many of you know what X is? "- obviously the more unusual or provocative "X" is, the better reaction you'll get.
Another way to be memorable in an informative speech is to punctuate a specific stat or point by saying it twice, and providing a little preamble. It slows down/changes the pace of your speech, which draws emphasis to what you're saying.
It also provides engaging information which is unique and desired by the audience.
Besides, informative speech can include objects, procedures, event and other innovative ideas.