Smile for the camera
Dallas makes new friends in his investigation into tooth decay. Find out why some of our ancestors had better gnashers than others, and how you should look after your own.
Grin and bear it
And now a friend Dallas was less keen to meet... open wide now.
Puzzle: Fold me to the Moon
How many times would you need to fold a piece of paper in half before you had a wedge tall enough to reach the Moon?
In the Clips section above, Dr Yan shows you how to work out the surprising answer to his latest brain teaser. In fact, it just might be the answer to everything.
Spectroscopy is a technique used to analyse light by breaking it apart into its component colours. Astronomers use it to work out the composition of stars.Watch more BBC videos on spectroscopy
Ask Yan: How do you make a rainbow?
Tia from Southend-on-Sea once asked Dr Yan: How do you make a rainbow? In this video Dr Yan does what he does best and explains the answer.Watch Dr Yan explain how you make a rainbow
- Series Producer
- Paul King
- Series Editor
- Dermot Caulfield
- Liz Bonnin
- Dallas Campbell
- Jem Stansfield
- Yan Wong