We estimate that about 5 to 8 percent of a random sample of children have ADD.

NPR: Excerpt: 'Delivered from Distraction'

After the initial contributions had been made, the game continued for a random number of turns, with each player, in turn, being able to add to or subtract from his contribution to the pool.

ECONOMIST: Human evolution

Ulevitch's hacker paranoia inspired him to add an extra security feature: All DNS servers tag data with one random number (from 1 to 65, 000) to enable servers to recognize the right piece of data at the right time.

FORBES: No Phishing Zone

But he said transcranial random noise stimulation could help more people because it had the potential to improve the ability to add, subtract or multiply a string of numbers in your head - not just new number learning.

BBC: Brain stimulation promises 'long-lasting' maths boost