This growth was fueled by breakthroughs in molecular biology and many engineering technologies, symbolized by the Human Genome Project, arguably the greatest biomedical engineering accomplishment ever, and realized with creation of the National Institute of Biomedical Imaging and Bioengineering.
3.1 The maximum number of units a student may take during the winter session is one unit per week, plus one additional unit. Thus, the maximum number of units is normally 4.
I think 14 units was very doable and I'm actually doing it again summer 2015 (this summer). Edit: This is linked from the Berkeley summer sessions page. Maximum Units in Summer. Berkeley Summer Sessions highly recommends a maximum of 10 units per session during Summer Sessions.