Check your subscription status, update your details and more. Which animal has the most sensory access to reality? Given the worldwide impact of carbon dioxide, why is it still used to put the fizz in water and soft drinks? **Given the worldwide impact of carbon dioxide, why is it still used to put the fizz in water and soft drinks?** _Last Word is New Scientist’s long-running series in which readers give scientific answers to each other’s questions, ranging from the minutiae of everyday life to absurd astronomical hypotheticals.
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