How encryption hides all around us, how it was used in 18th century Paris to separate merchants from their money and the difference between your brain and your fingertip.

A proposal to bioengineer shorter humans with cat eyes, a decades-old idea for a totally new kind of power, a battery made from trash and Bill Nye the Science Guy tries to get us in gear.

A small city known for its Amish population and surveillance cameras, an old lady in Northern Ireland who watches video feeds in Brazil and getting footage from the fin of a shark.

The man who collected too much data, cyborgs who want to make their body-hardware mainstream, robots that rebuild your hairline and a conversation with Lieutenant Commander Geordi La Forge aka LeVar Burton.

A therapist who creates virtual reality experiences for people with dangerous disorders, a grandmother who uses a headset to escape her surroundings and Ernest Cline on virtual reality in fact and fiction. Listen, decode, and decide: Can alternate realities save us?

A toddler who saved her mother’s life with Siri, a man whose mysterious ailment opened up a world of voice recognition technology and a dating service that wants to scan the faces of all your exes. Listen, decode, and decide: Can recognition software save us?

Can it save us?

The key starts with zero. Once you've cracked it head to codebreaker.codes.

Marketplace Tech and Tech Insider on data tracking.