An elapsed-time refrain separates rapidly changing conditions
Interrupt a dense chronological explanation with brief, visibly separate statements of elapsed time, then tie each interval to the conditions or processes that have changed.

Astrophysics for People in a Hurry
Neil deGrasse Tyson · 83 weeksAn elapsed-time refrain separates rapidly changing conditions
SHORT SOURCE EXCERPT“A trillionth of a second has passed since the beginning.”
The account identifies uncertainty about the Planck era, then places standalone time sentences at a trillionth of a second, a millionth, one second and two minutes. Between them, it describes changing temperatures and which particles or nuclei the conditions can sustain, before expanding the next interval to hundreds of thousands of years.
The time statements give a reader a recurring place to reset the scale amid technical exposition. Their usefulness comes from the change in physical conditions explained around them, rather than from date labels alone.
The source in context.
The opening chapter moves from the earliest conditions described by the account through particles, atoms, stars, planets and life. Standalone time statements punctuate the dense early sequence, while the chapter also identifies limits to what the theories explain.
Open this chapterWhat this example supports
The time statements give a reader a recurring place to reset the scale amid technical exposition. Their usefulness comes from the change in physical conditions explained around them, rather than from date labels alone.
Its limit
This is the chronology and scientific account as presented in the source. The pattern does not certify its exact quantities, and the initial statement of theoretical uncertainty must remain attached to the account.
Source & edition
Neil deGrasse Tyson, Astrophysics for People in a Hurry; supplied W. W. Norton First Edition ebook text, copyright 2017; e-book ISBN 9780393609400.
Supplied text, lines 100–158. The short quotation is checked against the source.
The completed whole-source AI synthesis supplied candidate observations and the broad argument map. This Codex editorial pass checked original source headings, section boundaries, openings and selected argumentative contexts; inspected every retained example; checked the existing pattern dictionary and base examples; and rewrote or rejected nominations. It is a source-checked editorial pass, not a new independently adjudicated whole-book reading.
supplied W. W. Norton First Edition ebook text, copyright 2017; e-book ISBN 9780393609400