Author: Morgan Powers

  • The Science of Hand Dryers

    Do you consciously consider the most sanitary way to wash your hands while washing them? According to the Centers for Disease Control and Prevention (the CDC), the correct process for washing your hands is (1) wet your hands, (2) apply soap, (3) scrub for at least 20 seconds, (4) rinse, and finally (5) dry your hands with a clean towel or air dry them. Air drying your hands is an easy, environmentally-friendly way to dry your hands. However, is there even any point to washing your hands in the first place if you’re just going to air dry them after? To put it simply: no.

    Every time you flush the toilet, bacteria as well as fecal matter is shot into the air, reaching heights of 15 feet. This is then sucked into the air dryers and blown onto your hands (Cassella). This type of fecal bacteria can cause diseases (Mayo Clinic).

    An experiment was conducted at the University of Connecticut. Petri dishes were placed in bathrooms, one away from the air dryer and one under the air dryer. The one away from the air dryer had approximately one bacterial colony present, while the one exposed to 30 seconds of air dryer air had approximately 18 to 60 bacterial colonies per plate.

    If you can’t use hand dryers, what should you use instead? According to the Mayo Clinic, “from a hygiene viewpoint, paper towels are superior to electric air dryers.” When you rub the paper towels against your wet hands, they create friction, which helps in removing germs (Petri).  The Mayo Clinic also concluded that people preferred paper towels over air dryers – 55 percent preferred paper towels in 2009.

    What if paper towels are not an option? Which option results in less bacteria – an air dryer or not drying your hands at all, considering the wetness of your hands can increase the survival of bacteria? The Mayo Clinic performed a study on the cleanliness of air dryers comparing the bacteria on your hands before and after air drying, and the air dryers increase the number of bacteria on your hands.

    To conclude, avoid air dryers at all costs, unless you enjoy coming out of the hand-washing process more dirty than when you started.

    Resources:

    Are Hand Dryers Sanitary? (n.d.). Retrieved from https://www.kidzsearch.com/kidztube/are-hand-dryers-sanitary_b338e6e4f.html
    Cassella, C. (n.d.). Here’s The Gross Truth About Bathroom Hand Dryers. Retrieved from https://www.sciencealert.com/bathroom-hand-dryers-spread-bacteria
    CDC Features. (2018, October 11). Retrieved from https://www.cdc.gov/features/handwashing/index.html
    Perez, C. (2018, February 08). Viral Facebook post has people thinking twice about using hand dryers. Retrieved from https://nypost.com/2018/02/07/viral-facebook-post-has-people-thinking-twice-about-using-hand-dryers/
    Petri, A. (2012, December 14). The paper towel-hand dryer wars are over. Retrieved from https://www.washingtonpost.com/blogs/compost/wp/2012/12/14/the-paper-towel-hand-dryer-wars-are-over/?noredirect=on&utm_term=.96765f857320
  • Save the Ocean Through One Simple Step

     

    Throughout your week, take note of how many plastic straws you use. Do you use one when you go to eat at a restaurant, or when you buy an iced coffee? Is it possible you use plastic straws at home? If you use so much as one plastic straw in the next week, you could make one small change in your life to contribute to a drastic change in the environment.

    Screen Shot 2018-10-10 at 4.55.30 PM

    Made from petroleum, plastics are made into thermoplastics and thermosets (McGehee). Thermoplastics can be recycled and include items such as soft drink and water bottles, shampoo bottles, and shopping bags. These can be identified by locating the recycling symbol with either a “1”, “2”, “3”, or “4” label. These correspond to polyethylene terephthalate (PETE), high-density polyethylene (HDPE), polyvinyl chloride (PVC), and low-density polyethylene (LDPE), respectively. Thermosets include items such as liner in cereal boxes, styrofoam egg cartons, and baby bottles. These are identified with the recycling symbol containing a “5”, “6’”, or “7” which correspond to polypropylene (PP), polystyrene (PS), and other. Thermosets cannot be recycled because they would scorch in attempt to reheat and remold the plastic (Cowan).

    Plastic straws are usually a polypropylene – they can’t be recycled. Additionally, over 500 million plastic straws are used by Americans daily, they are the 11th most found ocean trash, and it can take a plastic straw up to 200 years to fully decompose (Hugh). Because they are on the smaller side of non-recyclable plastics, they can do more harm: “The smaller those pieces get, the more places they can go” (Science News for Students). As these plastics become smaller and smaller, they become what it known as “microplastics”, making them more likely for marine life to ingest. In a recent study, it was found that zooplankton, that had swallowed plastic in algae, laid smaller eggs that were less likely to hatch (Science News for Students). If we do not start cleaning up our act, there will be more plastic than fish in the ocean by 2050. Although that may sound futuristic, it is just over a few decades!

    If the environment isn’t important enough, plastic straws also have a negative effect on you – they cause bloating, cavities, ingesting chemicals, wrinkles, and excess sugar and alcohol consumption (Perspective).

    Now that you’re convinced, how do we fix this problem? There’s an obvious solution: simply stop using straws. Although this may not affect you directly, there are people who have no choice but to use straws due to medical reasons. And, of course, some people simply prefer to use straws. Therefore, the absence of straws is not necessarily the best option for the majority. What about compostable straws? Although there is a good intention behind the creation of these, there is still the issue of whether people correctly compost the straws – unfortunately, this is not the best solution either. So, what is?

    Buy a metal straw (or multiple)! They can be found online for only a few dollars, and typically come with a straw cleaner. They are a great alternative to typical plastic straw – they’re reusable, they protect our environment, and they prevent ingestion of chemicals (although, you may still end up with wrinkles). Go plastic straw-less today to protect our home!

    Resources:

    Cowan, S. (n.d.). Plastics by the Numbers. Retrieved from https://learn.eartheasy.com/articles/plastics-by-the-numbers/

    Hugh. (2018, September 24). Environmental Impact of Plastic Straws (2018 Facts & Statistics). Retrieved from https://get-green-now.com/environmental-impact-plastic-straws/

    McGehee, A. (2006, Nov). There are plastics and there are bioplastics-how much do you know? Countryside and Small Stock Journal, 90, 86-89. Retrieved from http://prx.library.gatech.edu/login?url=https://search-proquest-com.prx.library.gatech.edu/docview/197239104?accountid=11107

    Perspective | Plastic straws aren’t just bad for the environment – they can be bad for your body. (2018, July 03). Retrieved from https://www.washingtonpost.com/lifestyle/wellness/plastic-straws-arent-just-bad-for-the-environment–they-can-be-bad-for-your-body/2018/07/02/d682fdfe-7964-11e8-aeee-4d04c8ac6158_story.html?noredirect=on&utm_term=.354afd959b55

    Tiny plastic, big problem. (2015, Apr 10). Science News for Students, Retrieved from http://prx.library.gatech.edu/login?url=https://search-proquest-com.prx.library.gatech.edu/docview/1672359979?accountid=11107

    Why This Matters. (n.d.). Retrieved from https://www.strawlessocean.org/faq/