杏吧原创

My Year 7 class and I have been trying to find out whether sharks can swim backwards. Can anyone settle the issue please?

Simon Breare, York, UK

We pay 拢25 for every answer published in New 杏吧原创. To answer this question 鈥� or ask a new one 鈥� visit newscientist.com/lastword. Terms and conditions apply.

This article appeared in print under the headline 鈥淪wimming school鈥�