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The best of 2021 Update

by David, 29 December 2021 | 0 comments

Photo of a cat crouching on the ground.

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!

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Fractional puppies Brainteaser

by David, 27 June 2018 | 0 comments

Brain icon

Kelly has a pet store. She recently got in a whole litter of puppies and tried to sell them all. On the first day, she sold half of the puppies, plus half a puppy.

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Double Helix Extra: your new email update! Update

by Jasmine, 28 February 2018 | 0 comments

10 year old holding tablet and atomic model.

Double Helix magazine is excited to announce that we’re merging our newsletters Science by Email and Maths by Email, and adding a splash of technology and engineering news. Keep an eye out for our new look email, called Double Helix Extra!

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Brainteaser: Fred’s weird teacher Brainteaser

by David, 18 September 2014 | 0 comments

Macro shot of human hand drawing red check mark in checklist box

Fred’s teacher has a weird way of marking tests. He gives five marks for a right answer, but subtracts one for a wrong one. Fred answered 20 questions on a test and got 70 marks. How many questions did Fred get right?

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