It takes a lot of practice to fly model planes precisely, and even experts might have difficulty in hitting a vulnerable spot such as a window.

FORBES: Even With Explosives, Model Planes Just Aren't That Dangerous

The other 90% of clients operate on a pay-for-performance model and do not pay Achievers unless the employees receive points for hitting their goals or driving business results.

FORBES: Achievers Gets Sequoia's Capital To Boost Employee Engagement