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 5 pm this Sunday (Apr. 19). Be sure to include your name and let me know if you're in the  Sect. 2 (8 am) or Sect. 3 (9:30 am) 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.