As they do, we must learn their lessons.

WHITEHOUSE: President Obama Addresses the Nation

When teaching small children to read, for example, tightly scripted lessons, their exact content and timing honed by randomised trials, do best.

ECONOMIST: Automated decision-making

But historical experiences do yield lessons that convince peoples and their leaders to change their behavior to avoid expected, and undesired, consequences.

NPR: 'Folly of Empire' Offers Critique of U.S. Imperialism