In English, many vowel shifts affect only vowels followed by /r/ in rhotic dialects, or vowels that were historically followed by /r/ that has been elided in non-rhotic dialects.

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When Black Holes Merge, They'll Ring Like a Bell

Married couples who merge finances may be happier, stay together longer

Two Massive Touching Stars Will Merge as Black Holes in 18 Billion Years, Astronomers Predict

Astronomers discover rare pair of quasars about to merge into new galaxy | Astronomers used multiple telescopes to confirm the double quasars.

Mesmerizing: Watch Water Droplets Merge on the International Space Station

Watching water droplets merge on the International Space Station

Black Holes Shouldn’t be Able to Merge, but Dozens of Mergers Have Been Detected. How Do They Do It?