Unexplained Phenomenon

Why is the keyword "Unexplained Phenomenon" on top of Google Trends today? Is it because of the Google doodle on Google's homepage or is it because of the Exeter UFO Festival? To make it more interesting and confusing, Google has posted an encrypted message on its Twitter account:

1.12.12 15 1.18.5 20.15 21.19

What is this all about? You can find some attempted explanations here .

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