The green slime is called Rad Slime. It has not yet been added to the game, but, by using commands you can spawn it. The Rad Slime emits some radiation because of which you cannot stay too long near them. On the slime wikia it says it will be added in the
George Washington wore several different sets of dentures over the course of his lifetime, none made of wood. Instead, the dentists treating him would have used the cutting-edge materials of the time: bone, ivory, lead, brass, gold, and the castaway teeth of horses, donkeys, cows, and, yes, human beings.
But the face of the statue came from a life mask that Houdon made of Washington at Mount Vernon. Afterwards, while still at Mount Vernon, Houdon also made a clay bust (see above) that Houdon presented as a gift to George Washington before he left. It is now on display in the museum at Mount Vernon, while the Morgan Library in New York City owns the original Houdon life mask of George Washington.