<http://webisa.webdatacommons.org/237107762>	<http://www.w3.org/ns/prov#value>	"A sensor can sense whether the laser hits clean or scratched mirror by the strength of the reflection." .
<http://webisa.webdatacommons.org/237107762>	<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>	<http://www.w3.org/ns/prov#Entity> .
<http://webisa.webdatacommons.org/prov/164894582>	<http://www.w3.org/ns/prov#wasDerivedFrom>	<http://webisa.webdatacommons.org/237107762> .
<http://webisa.webdatacommons.org/237107762>	<http://www.w3.org/ns/prov#wasQuotedFrom>	<howstuffworks.com> .