Exact(28)
Nothing certain, except that we have to move".
Nothing certain is known of what the properties of the space-time-continuum may be as a whole.
Nothing certain is known of Lopes' early life, and his name is first mentioned in 1418, when he was already keeper of the royal archives a post he long held.
Nothing certain is known about his life and work.
Nothing certain is known about the relative chronology of his writings, but this is not an issue of much importance, since his commentaries may well represent the results of many years of teaching, with later insertions and additions, in a way quite similar to Aristotle's own texts.
But there is nothing certain about Jenkins's replacement.
Similar(31)
Still, nothing is certain.
But nothing is certain.
Nothing is certain.
Nothing's certain.
"Nothing is certain," she said.
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Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com