Business is constantly changing, constantly evolving.

I want entrepreneurs to be engineers and scientists and designers; they don't necessarily have to be Internet entrepreneurs or retail entrepreneurs.

Hire inexperience. This year we plan to hire 200 engineers - half of whom are recent grads. Young people are not burdened by years of experience. They haven't learned - or been told - what is right or wrong. With engineering, there is no tried and tested path. You try, and fail, and fix, and fail again.

Nobody wants the expenditure of a lease on a factory which lasts 21 years. You can't plan 21 years ahead.

Some of the best inventive moments are born out of 'wrong thinking'. Most people start with the right way so they all follow the same path. The wrong way will lead to mistakes from which you can learn and create new discoveries-the kind of original ideas that come to life when we dare to be different, keep an open mind, and have no fear of failure.

An inventor's path is chorused with groans, riddled with fist-banging and punctuated by head scratches.

Cordless vacuums are designed for quick jobs, but you need enough power to do the job; you don't want the power waning over time.