Alan Axworthy, Director of Engineering at Northern Power Systems, shows a cross section of a wind turbine blade while presenting information on wind power to Randolph Union Middle Schoolers during Energy Day, Friday, February 15, 2013. Randolph Union Middle Schoolers got involved on Energy Day by breaking up into teams and participating in a question and answer session with a guest speaker involved in one of the fields of wood fuel, wind power, solar energy, hydro power and fossil fuels. (Herald / Zach Nelson)