<http://webisa.webdatacommons.org/76863167>	<http://www.w3.org/ns/prov#wasQuotedFrom>	<stackoverflow.com> .
<http://webisa.webdatacommons.org/76863167>	<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>	<http://www.w3.org/ns/prov#Entity> .
<http://webisa.webdatacommons.org/prov/286455453>	<http://www.w3.org/ns/prov#wasDerivedFrom>	<http://webisa.webdatacommons.org/76863167> .
<http://webisa.webdatacommons.org/76863167>	<http://www.w3.org/ns/prov#value>	"My challenge is detecting whether two balls collide or not." .