Researchers 'Lost' 17,000 Wallets in Hundreds of Cities to See What People Would Actually Return

The study was a meticulous social experiment that took three years and over £400,000 to complete.

from gizmodo http://www.gizmodo.co.uk/2019/06/researchers-lost-17000-wallets-in-hundreds-of-cities-to-see-what-people-would-actually-return/