Closing your mouth or nose during a sneeze increases the pressure in the airways five to 20 times more than a normal sneeze. With no escape, this pressure has to be transmitted elsewhere and that can damage your eyes, ears or blood vessels. Though the risk is low, brain aneurysm, ruptured throat and collapsed lung have been reported.
Looks like they put off the science fair project for too long and had to throw this little number together the weekend before. Been there, I still remember mine: what genre of music will cats like? Hypothesis: classical. Result: hard rock. Sampled 4 cats over 5 genres, took an hour. Methodology was crap. Sample size was crap. It was a non-experiment that scraped a "you tried" grade