National Chemistry Week is October 19-25, and the theme this year is “Having a Ball with Chemistry – The Science of Sports.” To celebrate, the American Chemical Society, New York Section, is holding a special event featuring many interactive chemistry-related demonstrations for educators, students, and families at the New York Hall of Science on Saturday, October 25, from 10:00 a.m. – 4:00 p.m. Admission is $11.00 for adults and $8.00 for kids.