World 5 · Why Soap Works · 12 min · PRO
The soap molecule
A head that loves water, a tail that hates it
PRO · Microbe Zoo
World 5: Why Soap Works is part of PRO
The first world of Microbe Zoo is free. PRO opens the other 27 lessons in 6 worlds — simulations, quizzes and all.
PRO includes
- All 60 labs — every world, every lesson
- Practice exams and certificates
$8.33/mo, billed yearly ($99.99) · or $39.99 monthly