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Kent Taylor, the co-founder and CEO of Texas Roadhouse Inc., has died from suicide, his family said, after suffering “unbearable” COVID-19-related symptoms.

Taylor’s family and the restaurant chain said in a statement to The Hill on Sunday that the business executive “took his own life this week” after “a battle with post-Covid related symptoms, including severe tinnitus.”

Albert Einstein’s special theory of relativity famously dictates that no known object can travel faster than the speed of light in vacuum, which is 299792 km/s. This speed limit makes it unlikely that humans will ever be able to send spacecraft to explore beyond our local area of the Milky Way.

However, new research by Erik Lentz at the University of Göttingen suggests a way beyond this limit. The catch is that his scheme requires vast amounts of energy and it may not be able to propel a spacecraft.