So, these are two experiments that we have been doing in class. They each only took two days to complete (compared to our 3 week sessions now). The first one is for washed and unwashed hands. So, I drew a line down the center of the petri dish, which is filled with a coating of tryptic soy agar. And I took a sterile swab and swabbed one side and labeled it "unwashed". Then, I washed my hands and the airdried them (we were allowed to choose any way to dry our hands that we wished. The object was not to see who got the cleanest petri dish, but to see the differences in the washing and drying methods). So, as I said, i airdried my hands. Walked all around the room, flapping my wet hands in the air and humming a tune from Chariots of Fire. As I walked, I looked around the room at my absorbed classmates. Everyone carefully and completely immersed in their own experiment. Each carefully reading through the guidelines ::the instructions say to wash for 2 minutes:: By golly, they were gonna wash for 2 minutes! ::the instructions say to be creative with the drying method:: I walked around looking at those who were washing their hands and I believe that that was the most focused I have ever seen anyone while washing their hands. Then they would pause...think....think...react....stop!...think...decide how to dry their hands. By this time, of course, their hands were already partially airdried and thus contaminated. Some re-washed their hands to decontaminate, and some just went on about their business. As I passed the tables of people who were working on other projects, we exchanged greetings and "best of luck"s. My hands finally dried and I swabbed them and swabbed the other side of the petri dish. It sat in an incubator for roughly 48 hours at 37 degrees Celsius. Finished product:


As you can see, even my "washed" side of the plate has some pretty intense air-born microbes! You can kind of read where I labeled "washed" in the second photograph. So, guys, the object of this experiment was to see just how "clean" your hands get when you are "air-drying" them. Obviously, you can see that when you wave your wet hands around in the air, they do not get really "clean".
My second experiment was to see who was "Typhoid Mary". If you have ever heard the story (I'm sure I've already told it to you...but if not, you can look it up = google is a simply WONDERFUL invention!), then you know who Typhoid Mary is. So we were all given these gloves to put on (one each) and they were all numbered. I picked up #3 and slipped it onto my hand. It was easy because the gloves were all Extra Large. Then we walked around the room and shook 5 or 6 other people's hands and wrote down who and in what order and then recorded their numbers in our journals. You see, one of the gloves was contaminated with the typhoid bug....and we were to determine WHO was the perpetrator! We could deduce who it was by comparing our petri dishes to all the others:

As you can clearly see, I was infected with the Typhoid! My side of the petri dish, compared to all others, was basically this same result. So it was quite clear to everyone that I had indeed infected everyone else with my Typhoid via ripple-effect. I shook 5 different hands, they, in turn, shook 5 hands, and those people shook 5 other hands. So all in all, I was able to infect almost the entire classroom. There was an exception of 3 people who were uninfected, and this was pure Providence intervening.
On the Grasshopper and Cricket | | The poetry of earth is never dead: When all the birds are faint with the hot sun, And hide in cooling trees, a voice will run From hedge to hedge about the new-mown mead; That is the Grasshopper's--he takes the lead In summer luxury,--he has never done With his delights; for when tired out with fun He rests at ease beneath some pleasant weed. The poetry of earth is ceasing never: On a lone winter evening, when the frost Has wrought a silence, from the stove there shrills The Cricket's song, in warmth increasing ever, And seems to one in drowsiness half lost, The Grasshopper's among some grassy hills. John Keats | |
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