Little kids are looking at a lot of dots these days. The theory behind this increasingly popular practice is that an ...

Most people immediately count the larger, more obvious dots. However, the real challenge lies in the finer details. Hidden in the corners and edges of the image are several smaller, ...

Optical illusion: If you can count all the dots in this image, you’ll earn title of puzzle king of the day By Mahipal Singh Chouhan Published on: Apr 16, 2025 09:30 pm IST ...

Informally, a positive counting number larger than one is prime if that number of dots can be arranged only into a rectangular array with one column or one row.

For example, 11 is a prime number since 11 dots form only rectangular arrays of sizes 1 by 11 and 11 by 1. Conversely, 12 is not prime since you can use 12 dots to make an array of 3 by 4 dots ...

Crows can vocally count up to four. The intelligent birds recognize and react to numbers in a process similar to that of human cognition, according to a new study.