About: http://webisa.webdatacommons.org/372558456

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	Some very smooth surfaces, such as a glass door, can reflect the ultrasound pulses away from the sensors, so they don???t detect the obstacle in time.
http://www.w3.org/ns/prov#wasQuotedFrom	discovermagazine.com