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World 3 · Build a Dinosaur · 11 min · PRO

How big was it? Estimating mass

Bones as scales, and honest error bars

PRO · Dinosaur Dig

World 3: Build a Dinosaur is part of PRO

The first world of Dinosaur Dig is free. PRO opens the other 24 lessons in 6 worlds — simulations, quizzes and all.

  • Bones, joints and the two hips
  • Build a T. rex
  • Pose and balance: dragging tail or level tail?
  • Trackways: frozen moments
  • From footprint to hip height
PRO includes
  • All 60 labs — every world, every lesson
  • Practice exams and certificates

$8.33/mo, billed yearly ($99.99) · or $39.99 monthly

Unlock Dinosaur DigTry the free world
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