A very nice young woman from California recently told me she was floored to witness, for her first time ever, the beautiful flashing of fireflies in the dusk of Illinois. If fireflies are not native to your home land, It's certainly worth travelling to see. In Kansas and Arkansas these bugs are well loved by just about everyone. I have never travelled to Japan, or any other part of Asia, but have heard from travellers that fireflies also exist in those locales--as well as Brazil. In case you can not travel to look and wonder what type of math and science the yellow lights may be intimating, here are some nice blog articles I found for starters: https://www.inhs.illinois.edu/resources/inhsreports/autumn-01/firefly/ http://www.mostlycolor.ch/2012/08/firefly.html Cheers, Brad