These lectures have all been given many times, in various versions, mostly initially sponsored by the British Association for Advancement of Science Lecture Service, and mostly to senior school audiences but also to professional groups in the several fields, and several at the Royal Institution and Science Festivals.

The possibility of life on other planets The measure of our days
Pills, population and paradox The origins of life
Eggs, embryos and adults Eggs, embryos and ethics
Why so many sperms? Why is Mickey Mouse?
Pets, pests and parasites Apes, angels and ancestors
Cats, culling and conservation The design of alien ecologies
How to invent aliens - the rules Diversions, delights, and deviations
Reproductive Fallacies (First given as a Royal Institution Evening Discourse 1993)

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