unless you have really really high-temperature capacities and can measure them

• meat
• cheese
• pasta
• bread (all of the above attract animals)
• corn cobs (ok, you can, but they take forEVER)
• corrugated cardboard (glue chemicals)
• manure of horses, cows, and people (pathogen risk)
• egg shells (illegal in madison; take a long time)
• magazines (toxic ink)
• plastic
• metal
• computers
• people (probably never a good idea unless buried 6 ft. or deeper)