In this task you will be given a text passage from a trivia quiz. You should choose the category this question belongs to from these categories: History, Science, Social Science, Fine Arts, Literature. You can only choose one category, so if in doubt, please choose the closest match.
Q: In the chiral bag model of nucleons, this effect explains the origin of non-zero expectation values for fermion bilinears, and it has been proposed as a possible explanation for sonoluminescence. It has been measured to within 1% of its theoretical value using a polystyrene sphere attached to the tip of an atomic force microscope. Its namesake originally proposed it after investigating van der Waals forces in colloidal solutions, when he noted that fluctuations in the second-quantized electromagnetic field could explain the interaction between two neutral particles. FTP name this effect that describes the attractive force between two uncharged conducting plates in a vacuum, which is named for a Dutch physicist.
A:
Science