Why can't I recycle pizza boxes?

Pizza boxes generally contain grease and/or food residue that make them unable to be recycled.

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1. What do the little numbers on the bottom of plastic containers represent or stand for?
2. Can I bag my recyclables?
3. What should I do with Styrofoam packing materials?
4. Should plastic bottle caps be recycled or not?
5. Do I need to take the labels off jars and cans?
6. How clean do containers need to be before I toss them into the recycling cart?
7. Why can't I recycle pizza boxes?
8. Do I have to separate glass, plastic, aluminum, and steel?
9. Should I step on plastic bottles and crush cans before recycling?
10. What are the basic procedures for recycling aluminum cans?
11. Is paper worth any money when you recycle it?
12. What can I do with packing peanuts?