<span>People from West Africa used to greatly desire salt, because in Africa salt was far rarer and more valuable than gold. Ghana famously managed the trade between the east and west of Africa, ensuring trade was fair - an ounce of gold for an ounce of salt.</span>
<span>Archeologists have found a variety of objects carved from animal bones or tusks as well as mammoth bones with tooling marks in many locations in Florida (the National Park Service).
In other words, there should be three independent resources confirming each pieces of questionable data. This cross-checking can be done different ways.
