From a seaweed extract called alginate to the element calcium, learn how chemistry affects our everyday lives. Both materials will be among the host of subjects available for explanation and demonstration at the annual Chemistry Fair, in celebration of National Chemistry Week, at Pyramid Mall in Lansing, Saturday, Nov. 3.

The event, from 10 a.m. to 5 p.m., is being sponsored by the Cornell-Ithaca section of the American Chemical Society. All booths will be near the Ames entrance to the mall.

Visitors to the Chemistry Fair will be able to take part in hands-on demonstrations by researchers and graduate students from Cornell University and Ithaca College. They promise, among many other things, to demonstrate why "opposites" attract and "likes" repel, and how to make a DNA necklace with real DNA. Visitors will be able to explore the world of polymers, try their hand at beating a chemical clock, at finding out how colors are made and making an indigo tie-dye parachute.

There will be handouts of free chemistry pencils, posters and magazines.

For more information, contact event coordinator Joy Swanson at Cornell University, (607) 255-4408 or jes21@cornell.edu .