About: http://webisa.webdatacommons.org/262601482

Property	Value
http://www.w3.org/1999/02/22-rdf-syntax-ns#type	http://www.w3.org/ns/prov#Entity
http://www.w3.org/ns/prov#value	The sensors, which operate like dipsticks to determine fuel levels, are part of a backup system to cut off the shuttle's three hydrogen-burning main engines if the tank runs dry due to a leak or other problem.
http://www.w3.org/ns/prov#wasQuotedFrom	tradearabia.com