Zig-zag patterns found on a fossilized shell in Indonesia may be the earliest engraving by a human ancestor. The engraving is at least 430,000 years old, and done by the long-extinct Homo erectus. The oldest man-made markings previously found were about 130,000 years old. it could "rewrite human history". The engravings were made before fossilization, when the mussel was fresh between 430,000 and 540,000 years ago. The discovery could confirm theories that Homo erectus had significant manual dexterity and greater cognitive abilities than previously thought. If nothing else it proves boredom is a long standing human problem.
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