Royal Observatory. The following lectures will be held at 7.30 pm in the observatory lecture theatre, free.

November 21: "The Missing Matter of the Universe" by Mike Hawkins.

November 28: "The Night Sky in December" by Russell Eberst.

December 5: "The Sun and the Stones" by Richard Eltam.

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December 12: "Hubble Space Telescope and all the Stars That Ever Were" by Peter Brand.

December 19: "The Night Sky in January" by Russell Eberst. Information: 0131 6688405.

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Royal Society Lecture

On January 15 at 5.30pm, 6 Carlton House Terrace, London, the society's Michael Faraday lecture will be given by David Phillips (department of chemistry, Imperial College) "Ozone: Protector or Polluter?" Information: 0171 839 5561 ext. 2575.

University of Wales, Cardiff

November 20 at 4.10pm: "From pixels to people - face recognition and principal components analysis" by Mike Burton, University of Glasgow school of psychology. Contact: 01222 874007.

November 24 at 5.15 pm: "The cultural politics of postcolonial proxies" by Laura Chrisman, University of Sussex centre for critical and cultural theory. Contact: department of English, 01222 874822.

November 26 at 2pm: "Puff the Magic Powder" by Chris Marriott, Kings College University of London. Contact: school of pharmacy, 01222 874000 ext. 5817.

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November at 4.10pm: "Explaining the case of an English/Japanese bilingual with monolingual dyslexia using the hypothesis of granularity" by Taeko-Wydell, Brunel University. Contact: psychology department 01222 874007.