The Wollemi pine was known only from ancient fossils until a park ranger rappelled into a canyon outside Sydney in 1994 and found a grove still alive, and the exact location is now a state secret guarded by Australian rangers

The Wollemi pine was presumed extinct for 90 million years until a park ranger rappelled into a canyon outside Sydney in 1994 and found a grove of them still alive, and the exact location is now a state secret guarded by Australian rangers

Fewer than 100 mature Wollemi pines grow in the wild. Their exact location is a state secret, withheld from maps and guarded by a small circle of Australian rangers who reach the site by helicopter...