http://www.lowellsun.com/news/ci_32573405?source=AP

WILMINGTON -- From heating an ordinary nail to 2,800 degrees Fahrenheit to showing the screechy effects of carbon dioxide (dry ice) cooled to nearly 110 degrees below zero, the annual Science and Technology Fair at the Wilmington Middle School offered seventh-graders a tantalizing look at physics.

They also had an overview of some basic tools that support life in the 21st century.