Google Timeline is a snazzy experimental feature which generates timelines for search queries. That "experimental" part seems to be there for a reason, as the results for a Linux search claim that Linux has been around since the 1910ies. Then, after a brief reappearance in the 1920ies, it disappears from the radar, only to return triumphantly in the age of prog rock and platform shoes.
The error stems from Linux version numbers, such as 2.6.11 and 2.6.18, which Google misunderstands for dates. Another reason to keep version numbers of your applications simple, folks.
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