NASA/Dembinsky Photo Associates/Alamy
What makes galaxies spin in a certain direction? And do they all spin in the same direction?
John Cleveland,
Bloomington, Indiana, US
Marshal Hedin (CC BY-SA 2.0)
Is there a limit to how small an adult arthropod can be? If so, what is the reason for the limit?
Elaine Lovitt,
Gladwin, Michigan, US
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.
New…
