This study is exciting because it opens up interesting new avenues of research that could tell us more about the relative role of genes, environment and gender in terms of asthma risk, and enable us use this information to potentially prevent asthma in the future.
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Shoppers who don't bring their own bag will need to buy a bag for life costing 8p or 10p.
Temperatures will reach around 28 Celsius (82F) at their highest.
A minute's silence will be observed at 11am on Thursday in remembrance of those who lost their lives in the Manchester Arena attack.