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The votes are in! Here are our most popular posts from 2021, including news, activities and brainteasers. There’s sure to be something here to tickle your fancy!

By Mike McRae Double Helix magazine is looking for your questions! Our Microscope column answers the most intriguing science, tech, engineering and maths queries you can throw at us.

There are some giant things lurking in these questions. Some of them are easy to spot, and others are hidden. Can you uncover all the answers?

People record numbers in lots of different ways. This method was used by the Inca people and many others who lived near the Andes Mountains of South America.

Late last year, Jonathan Pace’s computer found something special. Jonathan is an electrical engineer who also manages computers for charities, so he has a lot of computers, but this one was nothing out of the ordinary. Except for one thing: the computer was running software from the Great Internet Mersenne Prime Search

Are you a magician? Or a mathematician! Guess someone’s number with this cool trick.