Archaeologists discovered what's thought to be a Neolithic moon-shaped calendar in eastern Serbia made from the tusk of a wild boar.

The tusk will be engraved with Lincoln's image and will have the date of his visit to the town on it. Markey is hoping to present the tusk as a gift to the town upon its completion this fall.

The objective is for the tusk to loop around twice or, in rare instances, three times. Even more esteemed are hairless pigs from the southern island of Tanna and, in the north of the country, a rare ...

The tusk, which measures nearly 28 inches long and is thought to have come from a male mammoth between 35 and 40 years of age, has been radiocarbon dated to 13,000 years ago.

Engraved tusk would have told farmers when to harvest crops up to 8,000 years ago. The moon-shaped calendar was found in Smederevska Palanka, Serbia ; ...