Horizon Season 51 Episodes

Episode 1

Sugar v Fat

55 mins

What's worse for us: sugar or fat? Twin doctors Chris and Xand Van Tulleken go on month-long high-fat and high-sugar diets to find out.

Episode 2

Swallowed by a Sink Hole

Professor Iain Stewart travels to Florida to investigate sinkholes, and why the geology of this state makes it the sinkhole capital of the world.

Episode 3

Man on Mars: Mission to the Red Planet

Horizon goes behind the scenes at NASA to discover how it is preparing for its most ambitious mission - to land astronauts on the surface of Mars.

Episode 4

The Power of the Placebo

Horizon explores why placebos work, despite containing no active ingredient, and explains how we could all benefit from their hidden power.

Episode 5

How You Really Make Decisions

Horizon uncovers the truth about decision making, revealing the intuitive part of your mind is a lot more powerful than you may realise.

Episode 6

Living with Autism

Professor Uta Frith shows how another kind of reality exists for people with autism and if many of us could be a little bit autistic.

Episode 7

The £10 Million Challenge

To celebrate its 50th birthday, Horizon invites the public to play a role in tackling the greatest challenges facing science today.

Episode 8

Where Is Flight MH370?

Flight MH370 disappeared en-route from Kuala Lumpur to Beijing. This covers what is known so far, and theories of what happened, including simulations that suggest it could be in an as-yet unsearched part of the Indian Ocean.

Episode 9

What's Wrong with Our Weather?

Physicist Dr Helen Czerski and meteorologist John Hammond examine Britain's recent extreme weather and ask if future seasons will include ever harsher winters.

Episode 10

Should I Eat Meat?: The Big Health Dilemma

Michael Mosley investigates the alleged danger in eating red and processed meat, and does a one month test on himself, doubling his meat intake.

Episode 11

Should I Eat Meat?: How to Feed the Planet

Dr Michael Mosley investigates the impact of meat production on the planet and discovers what meat eco-friendly carnivores should buy.

Episode 12

Allergies: Modern Life and Me

Horizon follows two allergic families to investigate claims that the modern western lifestyle is responsible for the 'allergy epidemic'.

Episode 13

Inside the Dark Web

Twenty-five years after the world wide web was created, it is now caught in the greatest controversy of its existence - surveillance. With many concerned that governments and corporations can monitor our every move, Horizon meets the hackers and scientists whose technology is fighting back. It is a controversial technology, and some law enforcement officers believe it is leading to risk-free crime on the dark web - a place where almost anything can be bought, from guns and drugs to credit card details.

Episode 14

Ebola: The Search for a Cure

This special episode of Horizon meets the scientists and doctors from all around the world seeking a cure for the Ebola virus.

Episode 15

Is Your Brain Male or Female?

An episode of Horizon documentary series. Prof. Alice Roberts and Michael Mosley look into the similarities of both gender's brains and whether nature or nurture come into play with several experiments.

Episode 16

Cat Watch: A Cat's Eye View - Pt I

Liz Bonnin and a team of experts conduct a ground breaking scientific study of cats, revealing how cats experience the world with the senses of their wild ancestors.

Episode 17

Cat Watch: The Lion in Your Lap - Pt II

Liz Bonnin and a team of experts conduct a ground breaking scientific study of cats. Discover how pet cats transform into predators.

Episode 18

Cat Watch: Cat Talk - Pt III

Liz Bonnin and a team of experts conduct a ground breaking scientific study of cats. They reveal the secret language of cats and why they meow to us but not each other.