India, Dec. 6 -- Brain teasers are short, clever puzzles designed to make the mind think in fresh ways. They often look simple, but they push us to use logic, patience, and careful observation.

Solving a brain teaser, even a tiny one, gives a small mental boost and makes the brain feel more active.

Here's such a brain teaser posted on X (formerly Twitter) by Maria Shriver, which challenges you to find the minimum blind draws needed to guarantee all three colours in a marble puzzle.

"Your brain likely needs a little brain teaser today," the caption of the brain teaser reads.

The brain teaser asks you to imagine a box filled with 13 blue marbles, 13 red marbles, and 13 green marbles, all mixed together, where you cannot see inside.

The...