I offer to create a device determining fresh and eatability of vegetables.

For this purpose I offer to use ordinary hamsters. It is well known that hamster will never eat anything with nitrates or spoiled.

Sure, it is a crazy idea but….. I suggest selling hamsters with instruction: "The hamster is trained and can determine nitrates and drugs. He can also determine the quality of vegetables. The goods are certified. The warranty period is for two years."

I am sure my idea will help you to become much wealthier. It is a gold-mine.