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This challenging optical illusion quiz will put your eyes to the test and you have just five seconds to solve it - but how ...

World Emoji Day is celebrated annually on July 17. That's because on July 17, 2002, Apple unveiled its iCal app at MacWorld ...

This riddle dates back to 1959—can you figure out the answer?

Test your knowledge of taxicab geometry, triangular numbers, the golden ratio and more.

In only its second year, the International Logic Olympiad is already booming as logic becomes more and more crucial in our ...

This is another riddle taken from one of the very first modern anthologies of riddles published in the English language, The Riddles of Heraclitus and Democritus, from 1598. Despite appearances ...

The Chase star Darragh Ennis regularly shares his own quizzes online, and one recent one was designed to challenge Harry Potter fans with some fiendishly difficult questions ...

Carol Vorderman was stumped by a showbiz question on Celebrity Puzzling - but can you solve it? Hosted by Jeremy Vine, the new Channel 5 quiz show sees stars take on mind-bending puzzles with ...

Darragh Ennis, also known as The Menace on The Chase, frequently shares themed quizzes on his TikTok account and his latest challenge is aimed at Harry Potter fans ...

Pythagorean theorem made easy: Essential tips every to solve complex geometry problems TOI Education / Jul 11, 2025, 18:22 IST ...