David: This weeks question:
What wood, traditionally used for pulley wheels and carving mallets, will sink rather than float in water—even after it's seasoned?
(b) Lignum Vitae
Answer: (a) Lignum Vitae
This species, whose name translates as "the wood of life," is both extremely dense and naturally oily. In woodworking, it has also been used for the bottoms of planes and guides for bandsaw blades.
Forget the answer, have you ever heard of this species of wood?