Â鶹´«Ã½

Would it be possible for humans to evolve into two different species in the future?

Heather (age 15), Hampshire, UK

Ìý

What is the best way to tie shoelaces? Mine never stay tied for very long. Jo Dunn, Cape Town, South Africa

Ìý

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.

Â鶹´«Ã½ retains total editorial control over the published content and reserves all rights to reuse question and answer material that has been submitted by readers in any medium or in any format.

Terms and conditions apply.