It's Pi Day, the day that celebrates π, which, written in decimals, begins 3.14, or March 14. For @TheConversationUS, Daniel Ullman, a professor of mathematics, writes about the silliness of Pi Day, and the universality of π, which, he says "lives not only in this universe but in any conceivable universe. It existed even prior to the Big Bang. It is permanent and unchanging."
In this article, also for @TheConversationUS, math professor Manil Suri makes the case for other math holidays. "For January, I nominate the Golden Ratio, phi," he says. "Phi equals 1.618…, and since there’s no Jan. 61, we could celebrate it on Jan. 6." He'd like to see shindigs for Euler's number (Feb. 7), and Feigenbaum’s constant delta (April 6 — or maybe 7, if we're rounding up). Read more here.