You must have access to a toilet with water that spins as it drains when the toilet is flushed. 
Flush the toilet and make a note of whether the water spins clockwise or counterclockwise (when viewed from above).  Then email me the result by midnight this Friday (Apr. 18). Be sure to include your name and let me know if you're in the  Sect. 4 (10 am) or Sect. 1 (2 pm) class.

No photographs please.

Many of the toilets on campus won't work.  The water doesn't spin, there is just a sudden whoosh as the water is forced down the drain.  If you can't find a suitable toilet then fill a sink with water and note the direction of spin as the water drains.

Here are some of the responses I have received in past semesters.