1.Matt Cutts: Try something new for 30 days
https://www.ted.com/talks/matt_cutts_try_something_new_for_30_days
2.Carol Dweck: The power of believing thatyou can improve
https://www.ted.com/talks/carol_dweck_the_power_of_believing_that_you_can_improve
3.Tim Urban: Inside the mind of a masterprocrastinator
https://www.ted.com/talks/tim_urban_inside_the_mind_of_a_master_procrastinator