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World 4 · Footprints Tell Speed · 12 min · PRO

Alexander’s speed formula

Stride length, hip height and speed

PRO · Dinosaur Dig

World 4: Footprints Tell Speed 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.

  • Trackways: frozen moments
  • From footprint to hip height
  • Walk, trot or run?
  • Teeth shapes and diet
  • Bite force and jaw levers
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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← From footprint to hip heightWalk, trot or run? →

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