Combine the vinegar and sugar in a small skillet and boil over medium-high heat, stirring occasionally with a wood spatula, for 3 to 4 minutes, or until glossy bubbles cover the surface. The syrup is ready when the spatula leaves a path as you run it along the bottom of the skillet. It should be quite thickened and syrupy. Take off the heat and cool before using. Keeps in a sealed jar in refrigerator for a month or more.
Recipe by Lynne Rossetto Kasper. Copyright © 2012.
Jeremy Bailenson, founding director of Stanford University's Virtual Human Interaction Lab, is studying whether the experience of being a virtual cow will make people feel more empathy. "[Our previous work] showed that if you had occupied the avatar of another person, you showed empathy toward them," Bailenson says. "But no one had ever tried this with another species."