Experimentation environment in Activity 4 of Airbags. Students select an investigation question, specify variable values, and observe the animation for each trial. Students can view a position or velocity graph of the airbag's and driver's motion, on the lower left. On the lower right, students can see their trial history, which they can use to sort trial outcomes and compare the graphs of multiple trials. This image relates to a paper that appeared in the April 19, 2013, issue of Science, published by AAAS. The paper, by Ton de Jong at University of Twente in Enschede, Netherlands, and colleagues was titled, "Physical and Virtual Laboratories in Science and Engineering Education."