Do bubbles act like insulation on the surface of your bath?  Will it prevent the need for that toe-burning hot water top up?  Find out in this QotW!  Plus, we ask how solar sails stay aloft on simple sunlight...

• Do bubbles keep your bath warmer for longer? - Naked Scientists Science Podcasts and Science Radio Shows
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• Do bubbles help washing up? - Podcasts
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• Bubbles that sink - Antibubbles - Kitchen Science
• Why do bubbles of gas form on the sides of the bath or glass while or after you have run ... - Questions