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Could it be possible that another life form in the universe has a lifespan measured in many hundreds or thousands of our years?

John Howes,

Cardiff, UK

Could Homo sapiens have outcompeted Neanderthals in part due to a superior running ability?

Martin Greenwood,

Perth, Western Australia

To answer this question – or ask a new one – email lastword@newscientist.com.

Questions should be scientific enquiries about everyday phenomena, and both questions and answers should be concise. We reserve the right to edit items for clarity and style. Please include a postal address, daytime telephone number and email address.

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