In addition to working from home recently due to a great deal of writing I need to accomplish in the next couple of months (manuscript, fellowship applications, preliminary exam prep, etc.), I’ve also been doing science experiments in my kitchen.
For the past month or so I’ve been developing a fermenting hobby – starting with kombucha. For me, kombucha was an acquired taste and ginger-lemon is still the only flavor I really like. And I really like it. Unfortunately it’s not cheap enough to drink it every day. On a graduate student budget, I try to prioritize other things first. That’s part of the reason I decided to get into fermenting, the other being that I just really enjoy working in the kitchen.
General Timeline Note 1: our apartment has been around 68 C during the day due to some extreme cold weather. This resulted in increased fermentation time. Note 2: I’m pretty paranoid about kahm yeast (or other) contamination so all of the passaging and bottling was done under our range vent with one of the gas burners on. This is probably overkill, but hey why not?
First SCOBY from bottle of plain, store-bought kombucha – 3-4 weeks
First passage from 2 cups of original, well-fermented kombucha – 2 weeks. This was then bottled and passaged.
Second ferment (carbonation) – 3 days at room temperature.
1/2 tsp added sugar
1 tbsp squeezed lemon juice
3/4 tbsp chopped ginger
I’m currently enjoying the first bottle as I’m typing this and I’m really enjoying it. I probably could have let the second ferment go another day because I like the extra carbonation and vinegar flavor, but we were out of town and I didn’t want an explosion on our hands while we were away. I had a friend come in a refrigerate the bottles. Overall, the kombucha took up the lemon and ginger flavors very well!
Science is all about observation and contemplation.
When you make an observation that the days of the year are becoming shorter as fall turns to winter and think to yourself, Huh – I wonder why that is, you are performing science. Granted, this isn’t the comprehensive, empirical method put forth by the likes of Francis Bacon, but it’s science in a philosophical sense.
Why is the grass wet with dew in the morning?
Why is the sky blue?
Why do we get sick?
This process is human nature. It’s what separates us from lesser animals and it’s turned the gears of human ingenuity for thousands of years. We tirelessly ask these questions when we’re young with the constant inquisition of Why? Why? Why?
Some of the most important foundational concepts in modern science were being explored in the years BCE (before common era). Foundations that we have since built upon to arrive where we are today. Today, scientists study phenomena like quantum entanglement and induced pluripotent stem cell therapies, but these observations would not have been possible without those that came before.
Though mathematics are not a natural phenomenon in the tangible sense – though that may be debatable considering math is an abstraction of mental processes – they are crucial in the advancement of the sciences, so I feel that their inclusion here is appropriate. After all, could we have landed on the moon without a little math? Not even close.
Some of the earliest instances of the use of mathematics are found in Ancient Egypt – as far back as 3,000 BCE. The area flanking the Nile River was subject to seasonal flooding, damaging property and homes. The Egyptians developed methods of geometric surveying, or “rope-stretching”, to define new land demarcations in which they could be free of the flooding.
They used plumb-bobs, short cubit sticks, and ropes of 100 cubits in length. They developed the cubit as a unit of measurement based roughly on the length from the elbow to the tips of the fingers, roughly 0.5 meters (or 19.7 inches). Historical references attribute different lengths to the original cubit, so that’s a matter of contention.
They also used 3-4-5 triangles as a way of finding 90o angles, an application of the Pythagorean Theorem, though the Egyptians are not credited with providing sufficient proof of the theorem to get full credit, essentially being “scooped” by the Greek math-wiz Pythagoras.1 (EDIT: Or at least I though they were. Edmark Law provided a more detailed account in the comments below.) This use of Pythagorean Triplets has also been reported to be used by ancient civilizations in China, India, and even Ancient Mesopotamia (modern-day Iraq).
Thanks to modern advances in the health sciences, the expected longevity of human life has increased markedly in the past century. Thanks vaccines and public sanitation! Our knowledge of medicine is really a knowledge of how our bodies work and respond to harmful events and its development has been a natural progression as a result of how aware we are of our mortality and morbidity. We use that knowledge to develop interventions that prevent or halt the damage of events. Interventions like vaccines, medications, surgeries, and even radiation. As it was in the mathematics, many of these methods were developed thousands of years ago in many different parts of the world.
Yet again, we have the Ancient Egyptians with some of the earliest known writings
outlining medical practice. A collection of papyri have been found that outline perspectives of medical approaches, the Edwin Smith Papyrus being the most well known for including only empirical, rational approaches to medical practice and leaving out much (not all) of the supernatural healing practices that were also practiced at that time.2 The papyrus largely outlines 48 cases of traumatic injury, including everything from examination to treatment (surgical, herbal, and a smattering of spells and incantations).
Similar medical texts have been found in Mesopotamia dating as far back as 2000 BCE, the most famous, the Diagnostic Handbook, written by a scholar of the time, outlines examinations, diagnoses, prognoses, and treatments in a similar fashion as did the Edwin Smith Papyrus. This particular medical text also happens to contain the first mention of etiology, the study of causation and an important factor in the development of modern public health, as well as therapy (yes, even the mighty Babylonians needed shrinks).4
As similar as many of these texts are, many containing mentions of herbalism (the root development in the production of medicine), no other region’s medical developments were as deeply affected by the influence of herbal remedies as they were in Ancient India. India’s record of medical knowledge dates back as far as 1000 BCE.
Ancient India’s premier medical text, the Atharvaveda, detailed accounts of using herbal remedies for myriad treatments. This herbalism helped give rise to the system of medicine, Ayurveda, or ‘complete knowledge for long life’, around 600 BCE. Ayurveda describes 8 fundamental fields of medicine, some of which are remarkably modern: internal medicine, surgery, pediatrics, ENT (ear, nose, and throat), toxicology, spirit medicine, ‘rejuvenation’, and aphrodisia. 5
In mentioning herbalism, let us not forget traditional Chinese medicine wherein herbal remedies are used commonly alongside acupuncture and massage.
Lastly, I would be remiss if I failed to mention Hippocrates, the famed Greek ‘Father of Western Medicine’. Hippocrates, from the Greek island, Cos, between 500-400 BCE, is associated with the Hippocratic Corpus, a collection of medical treatises. Though we are unsure of who all was involved in the development of the Corpus, it is thought that the best and most important treatises came directly from Hippocrates, including a few on epidemics. The Corpus outlines a multitude of rational (not magical) approaches and perspectives on medicine. And of course one of his greatest contributions to the field is the Hippocratic Oath, which is used by physicians to this day to lay a groundwork for their own moral and ethical practice of medicine. Scholars are unsure whether Hippocrates or one of his students wrote the original oath, but either way his influence resonates through the centuries.6
Physics & Astronomy
Astronomy, the study of celestial bodies (planets and stars) and events, is perhaps the cream of the crop when it comes to ‘popular science’, that is science that most people find fascinating. It tries to answer the question of, ‘where does it all come from?’ It’s impossibly large. It’s scenes of rocket ships blasting off, stars exploding, and black holes swallowing light itself.
By and large, physics is required in the study of modern astronomy. But astronomy came first by thousands of years.
Though every ancient civilization appears to have practiced astronomy, the first mentions of empirical (math and science based) astronomy arose in Babylon. It is believed that, through analysis of cuneiform tablets detailing geometric calculations, the Babylonians were able to track the movements of celestial bodies such as Mars and Jupiter as early as 350 BCE and were able to predict lunar eclipses as early as the 7<sup>th</sup> century BCE.<sup>7,8</sup>
This information eventually found its way to Ancient Greece where it was used, along with other principles, to further develop astronomy and, eventually, gave rise to more modern concepts in physics<sup>8</sup>.
I saved one of my favorite subjects for last. Being from Wisconsin, a state known for its beer and cheese – microbiology plays a very important role in my daily life. Interestingly, it’s among the oldest sciences practiced in human history… by far. Granted, the practitioners didn’t know they were conducting science, but science nonetheless.
In ethanol fermentation, microorganisms break down molecules of sugar and produce ethanol as a byproduct of metabolism. Thanks, microbes!
The use of microbiology to craft fermented (alcoholic) beverages has roots in the Neolithic age, specifically, the 7<sup>th</sup> millennium (7000-6000 BCE), in China where evidence was found of fermented concoctions of rice, honey, and fruit. The use of this alcoholic beverage, as it was (and is) in many cultures, is of enormous cultural significance<sup>9</sup>. Evidence of fermentation used to produce alcohol has also been found in ancient civilizations in Georgia, Iran, Sudan, Babylon, and Egypt (thanks Wikipedia).
Ethanol fermentation isn’t the only fermentation pathway, equally as useful is the lactic acid fermentation pathway. The sugar in the food that is going to be fermented is consumed by microorganisms and converted to lactic acid. The acid that is produced as a byproduct is what gives fermented products their bite and oftentimes is used to curdle dairy products. This method of fermentation is used to produce yogurt, cheeses, kimchi, saurkraut, and other cultured food products.
It’s absolutely fascinating how the oldest science practiced in the world has gone largely unchanged for millennia.
Paulson, J., Geoinformatics, F. P. T., & Paulson, J. F. (2005). Surveying in Ancient Egypt.
Frey, E. F. (1984). The earliest medical texts. Clio medica (Amsterdam, Netherlands), 20(1-4), 79-90.
Nunn, J. F. (2002). Ancient egyptian medicine. University of Oklahoma Press.
Horstmanshoff, H. F., Stol, M., & Van Tilburg, C. R. (Eds.). (2004). Magic and rationality in ancient Near Eastern and Graeco-Roman medicine (Vol. 27). Brill.
Wujastyk, D. (Ed.). (2003). The roots of ayurveda: Selections from Sanskrit medical writings. Penguin.
Hanson, A. E. (2006). Hippocrates: The” greek miracle. Medicine.
Ossendrijver, M. (2016). Ancient Babylonian astronomers calculated Jupiter’s position from the area under a time-velocity graph. Science, 351(6272), 482-484.
Jones, A. (1991). The adaptation of Babylonian methods in Greek numerical astronomy. Isis, 82(3), 440-453.
McGovern, P. E., Zhang, J., Tang, J., Zhang, Z., Hall, G. R., Moreau, R. A., … & Cheng, G. (2004). Fermented beverages of pre-and proto-historic China. Proceedings of the National Academy of Sciences of the United States of America, 101(51), 17593-17598.