According to recent 0 _____, at least some of the advice about health that was passed down to our grandparents by previous generations may actually contain some 17 .

A good example is the 18 between feeling cold and catching a cold. My grandmother was convinced that being outside when the temperature is low, or simply dressing in 19 clothes for the cold weather, was a sure way of catching a cold.

Now, as we know, colds are caused by viruses. Therefore, in the 20 of a virus, you cannot catch a cold – no matter how low the temperature or how 21 your clothing.

But 22 now think that we may have viruses in our bodies already, which are just waiting for the chance to turn into a cold. In cold weather, for example, blood vessels in the nose get smaller to stop heat escaping. 23 , also allows the cold virus to attack the nose or throat more 24 . So, perhaps Granny was right!