Wikipedia
CuriosityStream
CuriosityStream is a global ad-free subscription video on demand service. It exclusively delivers nonfiction documentaries and series about science, technology, history and nature. Launched on March 18, 2015, CuriosityStream is currently headquartered in Silver Spring, Maryland. CuriosityStream offers its users about 1,400 original and licensed titles and about 600 hours of nonfiction media.
As of December 8, 2015, Amazon Prime is offering CuriosityStream as part of its new 'add-on' subscription service. Amazon-CuriosityStream is a separate subscription from CuriosityStream's main SVOD plan in that it will only permit access via Amazon Prime's platforms and is only available to Amazon Prime members.