June 1912. An example of a full page of advertising from a Battle Creek, Michigan newspaper. There is an ad for the Wolverine Auto Cycle Co. over on the right side. Harley Davidson and Excelsior and Flanders 4 Motorcycles.
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Before the first detection of gravitational waves, we had no way of knowing if black holes could merge. So this discovery doesn't just confirm Einstein's prediction — it also reveals a new behavior in the cosmos that we never knew existed before.