The Lab retraced the research. Here's what it found.

What each study said, and whether the Lab got the same answer. Every result links to proof you can check yourself.

12 retraced10 held up1 didn't1 no verdict

• Do small classes help young children learn?

  ✓ Numbers check out

  The study said first graders put in small classes scored about 8.6 percentile points higher. The Lab retraced it: ✓ same result.

  The study

  The Lab's number

  Counts as holding up

  Independent rebuildCited by 1,116 studiesRead the whole story

• Do better-looking professors get better student ratings?

  ✓ Numbers check out

  The study said better-looking professors get higher student ratings. The Lab retraced it: ✓ same result.

  The study

  The Lab's number

  Counts as holding up

  Independent rebuildCited by 382 studiesRead the whole story

• How much psychology research holds up when it's repeated?

  ✓ Numbers check out

  The study repeated about 100 psychology studies, and said only 36% got a significant result again. The Lab retraced it: ✓ same result.

  The study

  The Lab's number

  Counts as holding up

  Independent rebuildCited by 8,484 studiesRead the whole story

• Does the name on a CV change who gets a callback?

  ✓ Numbers check out

  The study said CVs with white-sounding names got 50% more callbacks than similar CVs with Black-sounding names. The Lab retraced it: ✓ same result.

  The study

  The Lab's number

  Counts as holding up

  Independent rebuildCited by 5,025 studiesRead the whole story

• Do referees give dark-skinned footballers more red cards?

  ✓ Numbers check out

  The study gave 29 teams the same football data, and their middle answer was that dark-skinned players get red cards at 1.31 times the odds. The Lab retraced it: ✓ same result.

  The study

  The Lab's number

  Counts as holding up

  Independent rebuildCited by 773 studiesRead the whole story

• Does raising the minimum wage cost jobs?

  ✓ Numbers check out

  The study said raising New Jersey's minimum wage didn't cost fast-food jobs. The Lab retraced it: ✓ same result.

  The study

  The Lab's number

  Counts as holding up

  Independent rebuildRead the whole story

• Does high government debt kill growth?

  ✗ Doesn't hold up

  The study said rich countries with very high government debt stop growing. The Lab retraced it: ✗ different result.

  The study

  The Lab's number

  Counts as holding up

  Critics' code on the authors' dataCited by 3,177 studiesRead the whole story

• Does the brain's wiring predict where Parkinson's spreads?

  ✓ Numbers check out

  The study said the brain's wiring predicts where Parkinson's-like damage spreads in mice. The Lab retraced it: ✓ same result.

  The study

  The Lab's number

  Counts as holding up

  Authors' own codeCited by 302 studiesRead the whole story

• Does a 1986 figure for a forest pest's timing hold up?

  ⚠ Inconclusive

  A 1986 study gave one number for how spread out a forest pest's development is. The Lab couldn't retrace it fairly, so there's no verdict.

  The study

  No number came out of this run

  Counts as holding up

  Independent rebuildRead the whole story

• Does a 1991 model get the timing of a forest pest right?

  ✓ Numbers check out

  A 1991 study gave one number for how a forest pest develops as the season warms. The Lab retraced it: ✓ same result.

  The study

  The Lab's number

  Counts as holding up

  Independent rebuildRead the whole story

• Does the brain's wiring predict where Parkinson's spreads? A separate rebuild

  ✓ Numbers check out

  The study said the brain's wiring predicts where Parkinson's-like damage spreads in mice. The Lab retraced it: ✓ same result.

  The study

  The Lab's number

  Counts as holding up

  Independent rebuildCited by 302 studiesRead the whole story

• Does temperature explain how much water forests lose after a wildfire?

  ✓ Numbers check out

  The study said temperature explains about 15% of how much water northern forests lose after a fire. The Lab retraced it: ✓ same result.

  The study

  The Lab's number

  Counts as holding up

  Authors' own codeRead the whole story