Sling TV has added CuriosityStream to its lineup of add-on Video on Demand services, the companies announced.

CuriosityStream, which features documentaries on science, history, nature and health, is now available on Sling for $6 a month.

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Sling TV says both Sling Orange and Blue subscribers will receive a free preview of CuriosityStream unitl December 13, 2017.

The Orange plan starts at $20-a-month and includes ESPN and roughly 30 cable networks. The Blue package costs $25-a-month, and includes more than 40 channels including live network feeds in select markets as well as several Fox channels.)

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CuriosityStream was started by Discovery Communications founder John Hendricks in 2015 and it represents a return to Hendricks’ vision for the Discovery channels which of late have often featured reality fare that can insult the intelligence.  (Hendricks retired as chairman of Discovery in 2014; the company is now ruled by former NBC executive David Zaslav who serves as CEO.)

The VOD service, which has more than 1,500 titles, features such intellectually-inclined programs as Stephen Hawking’s Favorite Places and David Attengborough’s Light on Earth.

“We couldn’t be more thrilled to launch on Sling TV, America’s first live and on-demand television streaming service,” Clint Stinchcomb, CuriosityStream’s Chief Distribution Officer, said in a statement. (Stinchcomb worked for Discovery before the network changed its focus.) “Sling TV’s elegant, user-friendly platform makes subscribing to CuriosityStream extraordinarily simple, and gives viewers the ultimate power in on-demand viewing.”

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— Phillip Swann