You could also see it as a trap for users because they can move the cursor and inadvertently backspace away characters that were not the last ones keyed in.
While there are signs that a mushroom is poisonous, they are not consistent, and all mushrooms of unknown origin should be considered dangerous to eat.
"We see this as a very powerful research and development tool for the entire Disney company," said Artie Bulgrin, ESPN's senior vice President of research and analytics.
But its critics argue that it fails to deal with the key causes of inequality-low-quality teaching, crumbling buildings and widespread truancy in state schools.