About: http://webisa.webdatacommons.org/106250841

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	So, as fraternal twins are conceived within that small time window, grow at similar pace, and because there is no such thing as giving birth to only one twin but not the other, they are also born within a similarily small time window.
http://www.w3.org/ns/prov#wasQuotedFrom	stackexchange.com