Support Aeon

‘Becoming an Aeon supporter means joining the conversation of humanity – and ensuring it stays alive.’

Andrés P, Guatemala, Friend of Aeon

Aeon is a registered charity committed to the spread of knowledge and a cosmopolitan worldview.
But we can’t do it without you.

Donate now

Aeon is a registered charity committed to the spread of knowledge and a cosmopolitan worldview. Our mission is to create a sanctuary online for serious thinking.

No ads, no paywall, no clickbait – just thought-provoking ideas from the world’s leading thinkers, free to all. But we can’t do it without you.

Donate now

Derek Skillings
Philosopher of Biology, University of Pennsylvania

Derek Skillings is a biologist and philosopher of science. He is currently a lecturer at the University of Pennsylvania. His work has been published in Philosophy of Science, Biology & Philosophy, and Trends in Ecology and Evolution, among others.

Written by Derek Skillings

Essay/
Philosophy of science
Life is not easily bounded

Working out where one hare ends and another begins is easy; a siphonophore, not so much. What is an individual in nature?

Derek J Skillings