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<http://webisa.webdatacommons.org/385275397>	<http://www.w3.org/ns/prov#value>	"A high-power laser directed in a vacuum at metal foils a few microns thick generates protons when the laser interacts with impurities such as water or hydrocarbons on the surface of the foil, explained Ken Ledingham of the University of Strathclyde." .