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Think of a Number - Season 2 Episode 4 Seeing the Light

Trailer
Reflect on the speed of light and the colour of space. Why Father Christmas is never seen. See what your screen looks like in black and white, red, blue and green. A solar plane that could reach new heights and how you could ride on a sun-beam for free... So if you don't want to be in the dark switch on to see the light - from infra red to ultra violet. Meanwhile - Think of a Number - it's all relative! If 2 is company and 3 is a crowd, what are 4 and 5?

First Air Date: Apr 12, 1978

Last Air date: Feb 08, 1984

Season: 5 Season

Episode: 30 Episode

Runtime: 30 minutes

IMDb: 6.50/10 by 2.00 users

Popularity: 3.884

Language: English

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