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This week’s new questions

Is there such a thing as reverse altitude sickness, and is a cold brew really the secret to a great cup of coffee? Tell us what you think

When creatures accustomed to life at high altitude are brought to sea level, do they experience reverse altitude sickness?

Laura Montague, Godalming, Surrey, UK

Drop of coffee
Basak Gurbuz Derman/Getty Images

People often say that to brew the best coffee you must start with cold water. Are they right?

Bor Carr, Boulder, Colorado, US

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