text: Title: Topic 2 Part 1, Box plot explanation
  Body: It looks like the word "horizontal", not "vertical", should be used in the phrase "The <b>vertical line</b> inside the box marks the median (50%) of the distribution" in the description of sns.boxplot picture.
  
  Possibly, in the sentence "its <b>length</b> is determined by the 25th(Q1) and 75th(Q3) percentiles" the word "height" would be more suitable as well.