Train wheels are made from carbon steel, but the specific alloy, hardness, and design vary depending on whether they're carrying freight or passengers.
Hip implants use titanium, cobalt-chrome, polyethylene, and ceramic to mimic your joint. Learn what each material does and how long modern implants last.
Blood transfusion costs vary widely with insurance. Learn what affects your bill, how Medicare handles it, and ways to lower your out-of-pocket expenses.