BBC Two's flagship 50-minute science documentary series. This season marks its 40th anniversary.


Thursdays, 9pm, BBC Two

On TV: The Lost Civilisation of Peru
The rise and fall of one of the greatest and most mysterious civilisations of the ancient world.
Thursday 9pm, BBC Two

Are your senses overlapping?
Is Monday red? Do musical melodies have colours? Take part in our experiments to see if your senses overlap.
Do you see what I see? · Do you hear what I hear?

About Horizon
Information about videos, UK repeats, international transmissions, contacts and a series history.

Message board
Have your say on any of the subjects raised by the Horizon programmes.

Horizon pages archive
Programme summaries, Q&As and transcripts from previous series of Horizon back to 1997.