The aircraft carriers of the Nimitz Class are the largest warships currently in service in the world. At around $4.5 billion each, these carriers are the most expensive ship on this list. The ten ships of this class help the United States flex its military muscle around the world.
Introduction to China Jaw Crusher. Jaw crushers machine are invented in 1858 and first widely applied in road paving and then in mines.
According to the International Congress of Oral Implantologists, the world's largest dental implant organization, archaeologists in the 1930s recovered ancient Mayan skulls, with evidence that carved seashells had been nailed into the jawbone to create some of the earliest forms of artificial teeth.