My answer to What are the properties of cast iron and steel as the material used to make a crankshaft? https://t.co/honf2XAdkh
#crankshaft#ductileiron#materialselection
Unlike the hair of other mammals, polar bear hair is hollow. Examined under a microscope, each one has a long, cylindrical core punched through its center.
https://t.co/biijzdOYh3 #polorbear#insulatingmaterials