Everywhere you go, you generate a cloud of data. You're trailing data, everything that you do is producing data. And then there are computers looking at that data that are learning, and these computers are essentially trying to serve you better. They're trying to personalize things to you. They're trying to adapt the world to you. So on the one hand, this is great, because the world will get adapted to you without you even having to explicitly adapt it. There's also a danger, because the entities in the companies that are in control of those algorithms don't necessarily have the same goals as you, and this is where I think people need to be aware that, what's going on, so they can have more control over it.
We came into this new world thinking that we were users of social media and search engines. It didn't occur to us that social media and search engines were actually using us.

The third episode looks at anxiety and explores why it is so common. It talks to neuroscientists who explain the physiological and evolutionary basis of anxiety. Although it can help animals escape predators, anxiety can cause serious problems for human beings. It talks to sufferers of anxiety and examines the different types of anxiety people can feel. It also looks at how social media can cause anxiety.

The way that wars are fought is constantly evolving. In the warfare of today and the future, it's the push of a button rather than the pull of a trigger, bringing disorder without a single soldier setting foot on the ground. The real-world battlefield has morphed from the bloody trenches of the front line into an age of cyber warfare. From collapsing all the infrastructure of a country to changing minds for elections, any threat you can imagine can be done.

We learn as much from victory as we do from loss. We employ strategies to gain the advantage, unconventional methods to overwhelm adversaries. One dedicated force steeped in mystique has always been part of war. Special operations, elite and unseen. Their presence felt by lethal attack. From the biblical era to the future of warfare, the battle environment is reshaped and redefined by special operations. Special Operations soldiers have come out of the trenches and are entering new domains of warfare.

In the second episode, the murder of a political staffer in 2016 spawns a myriad of unfounded conspiracy theories as the man's family and the truth hang in the balance.
Following Seth Rich's murder, his parents filed a lawsuit with Fox News after conspiracy theories about his murder spread across the internet. Mary Rich told NPR that the combined trauma of her son's death and the attacks by conspiracy theorists caused intense and lasting distrust. After the case was resolved, Rich's parents said in a statement at the time that they were 'pleased with the resolution of this matter and sincerely hope that the media will take genuine precautions in the future'.

In this sixth and final episode, the FBI escalates its pursuit of an elusive hacker, but he soon turns the tables by questioning the legality of a key tool in their investigation.
We'll also find out how one man is being watched by the government for alleged Russian election interference. Is he responsible, or just a patsy for more powerful people? We'll have to get to the end to find out.