Registration has been extended for a workshop on pH and pH Indicators in Nature — the first in a series of science and math workshops for middle-school girls — to be held on  March 2, 3-5PM at Lasell College.  The series is being run by a Newton high-school student for her Girl Scout Gold Award.  Space available for 20 middle-school girls (non-Scouts are welcome), with a cost of $2 each.  Register via email to newtongirlsstem@gmail.com.