Here’s an awesome equation to figure out the temperature from the chirping frequency of crickets. Who doesn’t love math? From Molly Keck’s always interesting What’s Buggin’ Ya.
T = 50 + (N-40/4)
T = Temperature
N= number of chirps
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And don’t forget to check out Postcard Fiction Collaborative (yeah, nothing to do with this except that there’s an equation of sorts: photography).