GROTON -- On Thursday, May 21, at 7 p.m. the Nashua River Watershed Association will present "A Visual Introduction to the Geometry of Nature" with guest presenter Jonathan Choate, a mathematics instructor at Groton School and co-principal investigator for the National Science Foundation's "Fractals and Chaos" project. The program will take place at NRWA's River Resource Center, 592 Main St., on Rte. 119.

Choate's talk will describe an important discovery an English mathematician made in the mid '30s as he studied the lengths of coastlines. In addition, Jon will discuss the work done by mathematicians in the '70s which gave us an important tool for describing natural forms such as ferns, snowflakes, and river networks which, when combined with modern computer technology, allows us to create beautiful, complex images never seen before and to generate images that appear to be very natural. The talk requires no special mathematical or computer knowledge.

This presentation is free and open to the public. Pre-registration is requested. Contact Pam Gilfillan, NRWA Development Associate, at 978-448-0299, or email Visit for information.