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Mind

Can you and your family solve these mind-bending scientific riddles?

Featuring everything from eggnog to uranium oxide, these 12 brain-twisting conundrums will get you in the festive spirit and test your scientific knowledge

By Leonie Mercedes

11 December 2024

91av. Science news and long reads from expert journalists, covering developments in science, technology, health and the environment on the website and the magazine.

Kyle Ellington

Here are the questions. The answers can be found at the bottom of this page, but don’t scroll down until you’ve given them a good go.  

1. Uncle Johannes has outdone himself this year, serving up an eight-course Christmas feast (though some of the dishes are a little unusual). In order, the first seven courses are: mousse, vol-au-vents, eggnog, milkshake, jelly, soup and upside-down cake. What might the final course be?

2. This entity can be found travelling at near the speed of light under the Swiss-French border. Change one letter and you get the name of something it…

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