An Average from me. For the record:
Banana Peel Slip - Busted (with conditions). Adam and Jamie's testing showed that a banana peel on the ground is not guaranteed to make a person slip and other substances (specifically an animal birthing agent) are more slippery. They did show, however, that banana peel does increase the chance of slipping.
Pressure Cooker Diamonds - Busted. Tory attempted to recreate a scene from CSI: Miami where diamonds were created using graphite, ferric nitrate and other chemicals along with a small diamond in a pressure cooker to create a larger one. It did not work at all.
Peanut Butter Diamonds - Busted. Kari's attempt to create diamonds using peanut butter, charcoal and a microwave resulted in the destruction of two microwaves and no diamonds.
Hydrochloric Acid Diamonds - Busted. Rapidly cooling a mix of molten graphite and iron and then soaking it in hydrochloric acid produced no diamonds.
Explosive Diamonds - Confirmed. Using 5,000 pounds of explosives it was possible to turn graphite in to low quality, industrial grade diamonds. It was also possible to recreate this using a smaller explosion.
Double Dipping - Busted. After testing, it was found that the amount of bacteria in some salsa after double dipping was not significantly increased, certainly not to the point where there would be additional danger to humans.