All ten teacher plans

• Day 31 · Find a water place

• Day 32 · A puddle gets smaller

• Day 33 · Drops on the outside

• Day 34 · Give the arrow a job

• Day 35 · Try a fresh water story

• Day 36 · What would make the comparison fair?

• Day 37 · Keep zero, missing and spill separate

• Day 38 · Follow a public water-supply clue

• Day 39 · Make a water trail worth using

• Day 40 · What is clearer now?

Preparation · Teacher desk