About: http://webisa.webdatacommons.org/286604013

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	Methane is explosive as well.Ammonia, Hydrogen flouride, and Diborane are either reactive or toxic.Helium, Hydrogen and hot air are the most popular options, but none of them are as safe or cheap as plain old planes.
http://www.w3.org/ns/prov#wasQuotedFrom	ycombinator.com