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Question & Answer Christmas Special

Ever wondered …

* When birds of a feather flock together… what stops them colliding?

* If chillis don’t heat you why do they feel hot?

* Can infinity have different sizes?

* How much can your brain hold before it gets full?

* Does being cold have a big impact on catching a cold?

Aided by a panel of scientists - Professor Peter Coles, School of Physics & Astronomy at Cardiff University, Dr Sandy Knapp, botanist and taxonomist at the Natural History Museum in London and Professor Phil Jones, director of the Climatic Research Unit at the University of East Anglia - Quentin Cooper attempts to answer all these listener questions and more on a very special edition of Material World.