https://www.ted.com/talks/deepika_kurup_a_young_scientist_s_quest_for_clean_water
 A good simple and relatable topic that everyone can have a sense for, and besides it being a topic that  is connectable to virtually anyone it was also delivered well with engaging expression and tone, and an additional factor that helped it was adding statistics to give a number to the faces which she had opted the talk with to gives a personal sense to it.

https://www.ted.com/talks/jessi_arrington_wearing_nothing_new#t-35774
An interesting concept but not a reasonable one to get others on board with or connect with, gives off an uncomfortable vibe which can turn off an audience and also her example outfits are a little outside of the box which it significantly different to the average person listening, in some senses the whole thing can be viewed as if she is crazy, with the topic she is getting across and they way she is getting it across