A few days ago I was searching on Google about brief presentations, and found the 2-Minute Talk Tips web site, which is subtitled Become a better presenter in two minutes a week. Currently there are 60 podcast episodes. Each begins with a two-minute tip and then continues with a longer discussion (the bottom or bummock of the iceberg).
For example, Episode 26 is titled Bring Candy and Read Storytelling with Data. The longer part is a review of that book, which I blogged about on March 28, 2016 in a post titled A brief book review of Storytelling with Data by Cole Nussbaumer Knaflic.
The iceberg image came from Openclipart.