Everyone loves technical topics. Well not everyone, but a lot of students enjoy science and math. These branches of the Topic Tree aim to give those students what they want and to help those assigning papers, give those students what they want.
This branch includes everything from astronomy to zoology and all sorts of technical solutions along with their attendant problems. The subbranches are: Medicine and Life Science; Physical Sciences and Mathematics; and Computer Science, Engineering, and Technology. If you are unfamiliar with science topics, take a look under the tabs. You may be surprised at the diversity of what is all ready there. If you enjoy science topics, particularly mathematic, feel free to add more topics.
And yes, the Medicine and Life Science branch is due to split into smaller branches when it gets a few more topics. The Topic Tree just grows and grows.