Learn why the concept of zero is newer than you might think, how you can worry more productively, and why the Earth’s atmosphere might be rusting the moon.

The Concept of Zero Is Newer Than You'd Expect by Reuben Westmaas

• Matson, J. (2009, August 21). The Origin of Zero. Scientific American. https://www.scientificamerican.com/article/history-of-zero/
• What is the origin of zero? How did we indicate nothingness before zero? (2007, January 16). Scientific American. https://www.scientificamerican.com/article/what-is-the-origin-of-zer/
• Szalay, J. (2017, September 18). Who Invented Zero? Livescience.Com; Live Science. https://www.livescience.com/27853-who-invented-zero.html
• Devlin, H. (2017, September 13). Much ado about nothing: ancient Indian text contains earliest zero symbol. The Guardian; The Guardian. https://www.theguardian.com/science/2017/sep/14/much-ado-about-nothing-ancient-indian-text-contains-earliest-zero-symbol
• Brahmagupta: Mathematician and Astronomer. (2020, February 20). The Story of Mathematics - A History of Mathematical Thought from Ancient Times to the Modern Day. https://www.storyofmathematics.com/indian_brahmagupta.html

How to Worry More Productively by Kelsy Donk

• Ro, C. (2020). The surprising upsides of worrying. Bbc.Com. https://www.bbc.com/future/article/20200824-why-worrying-isnt-as-bad-as-you-think
• Anisa Purbasari Horton. (2018, March 20). How I Learned To Worry Productively. Fast Company; Fast Company. https://www.fastcompany.com/40543707/how-i-learned-to-worry-productively
• Skwarecki, B. (2017, March 20). How to Worry Productively. Vitals; Vitals. https://vitals.lifehacker.com/how-to-worry-productively-1793456809
• What is Productive Worry? (2012). Psychology Today. https://www.psychologytoday.com/us/blog/anxiety-files/200805/what-is-productive-worry

Earth's Atmosphere May be Rusting the Moon by Grant Currin

• Has Earth’s oxygen rusted the Moon for billions of years? (2020). EurekAlert! https://www.eurekalert.org/pub_releases/2020-09/uoha-heo083120.php
• Li, S., Lucey, P. G., Fraeman, A. A., Poppe, A. R., Sun, V. Z., Hurley, D. M., & Schultz, P. H. (2020). Widespread hematite at high latitudes of the Moon. Science Advances, 6(36), eaba1940. https://doi.org/10.1126/sciadv.aba1940
• Kramer, M. (2020, September 8). Researchers find rust on the Moon. Axios; Axios. https://www.axios.com/moon-rust-4a473774-6aa4-4b25-994c-7ba3f032d307.html
• NASA - The Moon and the Magnetotail. (2020). Nasa.Gov. https://www.nasa.gov/topics/moonmars/features/magnetotail_080416.html

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