This week's questions
How do certain species of birds like humming birds, terns, gulls and kestrels remain in the air without forward motion?
Abhayakumar Shah, Adoni, A.P.
In the layer of the atmosphere in which we live, ozone forms air pollution. But in the stratosphere it filters out UV radiation. How is this possible?
V.V. Balasubrayamanyam, Ananthapur, A.P.
Readers are requested to submit questions on science and technology and answers to the questions listed above. The answers should be as concise as possible. The Hindu reserves the right to use and edit the questions and answers for clarity and style. Unpublished questions cannot be answered individually. Questions of general interest will alone be published. Send your mail to The Editor, The Hindu (Science and Technology), 859-860, Anna Salai, Chennai 600 002.
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