July 15 is:

Mythicist Thomas Bulfinch's birthday

Gummy Worm Day

St. Swithin's Day

Mathematician Fibonacci's birthday

Physicist Jocelyn Bell Burnell's birthday

Painter Rembrandt van Rijn's birthday

Anniversary of Twitter's introduction

Woodie Wagon Day

Click on the date to find what special day it is:

July
7	6	5	4	3	2	1
14	13	12	11	10	9	8
21	20	19	18	17	16	15
28	27	26	25	24	23	22
				31	30	29
Special days on different dates