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This week’s questions

How does idli batter ferment? Where does the yeast that ferments the batter come from?

Aruna Venkatraman, Coimbatore, Tamil Nadu

How are galaxies photographed?

Uma Maheswari, Mallur, Tamil Nadu

Why is the earthing pin in the socket of electrical appliances so long and thick?

Preetish V.A., Panchavati Malgi, Karnataka

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