Pick a pear at the grocery — or an apple, tomato or banana, for that matter. You’ll notice that it wears a little sticker containing a mysterious number, such as 4035 or 94035. The numbers are codes that tell whether the fruit or vegetable is bioengineered, organically grown or conventionally grown (with pesticides and/or herbicides). [...] Genetically modified produce has a five-digit number beginning with 8. You won’t see many of these, though. Most bioengineered food is found in processed foods.