Srinath Mahankali, speller 159, is the brother of another champion -- Arvind Mahankali, who won in 2013.
Srinath correctly spelled "hypothesis" to stay in the bee.
His chuckle is reminiscent of his brother's -- he and others in the audience laughed after hearing this sentence:
Mr. Taylor admired his 6-year-old son's interest in science, but chose not to encourage him in testing the hypothesis that the family dog would feel prettier with eye shadow.