Pablo Durana

It may seem like it, but victims of stalking are not just celebrities and those in the public eye; the widely-misunderstood crime affects millions of people in the United States each year, people who are in perpetual fear for their lives; criminal psychologist Dr. Michelle Ward -- a stalking victim herself -- presents stories of the crimes and explores the twisted psychology of those who committed them; victims and their families also recount their personal experiences and provide firsthand insight into effective steps they took to protect themselves; Dr. Ward offers practical tips that viewers can use to keep themselves safe.

Follow professional climber Sasha DiGiulian as she rises from child prodigy to a champion sport climber, and ultimately makes her mark by taking her talents to the biggest walls on the planet with a series of bold, first female ascents. Confronting both physical and mental obstacles head on, Sasha charts her own course in a sport where a path didn’t exist, enabling her passion to become a viable profession.

From the mighty Amazon’s icy source to its plume reaching as far as the Caribbean, National Geographic Explorer teams conduct groundbreaking research to take the pulse of one of the planet’s integral and endlessly magical resources. From the health of river turtles and pink dolphins to the migration of Andean bears, extreme urgency is met by equally hopeful solutions.

Alex Honnold is the most accomplished free climber in the world. Angola is a southwest African country that recently emerged from 27 years of bloody civil war. What brings together these strange bedfellows you ask? Some of the most epic unclimbed rocks in the world, and a community needing help to diffuse the hidden land mines leftover from the conflict. (Plus a shadowy local hotel magnate, but we'll get into that later). This is Alex Honnold in Angola, for one of the most unique adventures of his storied climbing career this far.

Follows renowned cave explorer Bill Stone as he and his team push the boundaries of what has ever been done before as they attempt one of the greatest achievements of modern exploration — to set a new world record by venturing into the bottom of what is thought to be the deepest cave in the world.

After years of addiction and a life changing accident, André Kajlich aims to be the first double amputee to complete the Race Across America, a bone-crushing, sleep-deprived, 12 day, 3,082 mile bike race, revealing a true test of spirit and the pain we endure to carve our own path in life.

An explosive viral video shows a white policeman throwing a Black teenager from her school desk. One woman uproots her life to help the girl, face the officer, and dismantle the system behind the “Assault at Spring Valley.”