There's a café in France which charges €7 for a coffee to rude customers and €1.40 to people who talk politely to staff.
18
There are glasses which allow a red-green color-blind person to see colors the way everyone else does.
22
Putting your car alarm remote under your chin or beside your head increases its range.
-1
Genghis Khan exempted the poor and clergy from taxes, encouraged literacy, and established free religion, leading many peoples to join his empire before they were even conquered.
28
Billions of neutrinos pass unnoticed through your body every second.
6