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This week’s questions

How does the spark originate, when sodium metal is immersed in water, to ignite the hydrogenthat is produced in the chemical reaction between the two?

Prasanna Tallamraju, Visakhapatnam, Andhra Pradesh

Why does wet paper on drying or ironing develop wrinkles or uneven surfaces?

Venkatesh Shukla, Portblair, Andaman and Nicobar

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Sci Tech

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