How We KnowAnswer
Why Can We Read Mammoth DNA but Not Dinosaur DNA?
A frozen mammoth tooth can hold readable DNA. A dinosaur fossil can preserve the shape of a bone for far longer. Here’s why those are different feats.
THE QUESTION LIBRARY HOW WE KNOW
How do scientists tell a real signal or pattern from a lucky coincidence?
How scientists distinguish real signals from lucky fits: look-elsewhere effects, independent predictions, black-hole searches and data-window artefacts.
THE SHORT ANSWER
A pattern becomes convincing when it survives checks that could have exposed a mistake: a fair comparison with noise, allowance for all the searches performed, independent tests and scrutiny of the measuring equipment and analysis. A formula that fits familiar numbers is a starting point. It becomes stronger evidence when it predicts something it was not adjusted to fit, with clear uncertainty and plausible alternatives considered.
- Count the search, not just its best-looking result.
- Test whether the analysis can create the pattern it appears to find.
WHAT WE DON’T KNOW YET
No single significance threshold eliminates every error. A particular new claim needs its actual search history, data-quality evidence and noise assumptions examined.
WHAT WOULD CHANGE THIS ANSWER
An independently repeated result that survives broader search corrections and alternative noise models would strengthen a candidate claim.
A striking pattern asks for an explanation. Before treating it as a discovery, scientists also ask how easily the same search could have found something striking in data with no such signal.
THE LONG ANSWER
THE LONG ANSWER · ABOUT 3 MINUTES
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Keep asking
Why Can We Read Mammoth DNA but Not Dinosaur DNA?
Cold ground can slow DNA’s breakdown enough for short fragments to survive.
New here?
God Plays Dice answers big questions in plain words, with sources and one of six honest labels.
Words worth knowing (1)
- Spectral leakage
- Power spreading between frequencies because of how a data segment is bounded.
Sources & further reading
(3) · Checked Oct 5, 2026
- Trial factors for the look elsewhere effect in high energy physics ↗European Physical Journal CSearch-wide significance differs from fixed-location significance.
- Observation of Gravitational Waves from a Binary Black Hole Merger ↗Physical Review Letters / LIGO–Virgo CollaborationMultiple detectors, searches and noise checks supported GW150914.
- A guide to LIGO–Virgo detector noise and extraction of transient gravitational-wave signals ↗Classical and Quantum Gravity / LIGO–Virgo CollaborationUntapered segments can create spectral leakage and phase correlations.
See a mistake? Report a problem. Corrections are made openly.
CONTINUE THE THREAD
Where this question leads.
How We KnowAnswer
Mutation by Natural Dominance: One Mutation or a Hundred?
If 100 bacteria carry the same DNA change, did it arise once or many times? The answer matters when testing Ricardo Maldonado’s hypothesis.
How We KnowAnswer
Are the colors in space photos real?
A space image can be faithful to measured light without matching human eyesight. Here is how to read the translation.