The Room Behind the Walls
Open a working 3D bathroom and investigate the systems behind its walls. Flush with the supply closed, find out what stops the refill, work out why an unused basin starts to smell, compare hot-water time and waste, and diagnose unfamiliar faults. Eight guided investigations for ages 12 and up, with predictions, experiments and explanations grounded in the same room.
Library
Follow the water
Lesson 1
Water on the Way Up
Clean water reaches a tap upstairs even though there is no pump in the room. What pushes it all the way up?
StartLesson 2
The Water Is Turned Off
The water to the house is off. Why can the toilet still flush once, but not twice?
StartLesson 3
The Bend That Keeps a Secret
A sink drain lets dirty water out but keeps sewer smells from coming back in. How can it do both without a lid or moving door?
StartFind the hidden connections
Lesson 4
The Pipe That Does Nothing
Flushing a toilet can pull water out of the bend under a nearby sink. How can one drain affect the other when the sink’s tap is off?
StartLesson 5
The Long Wait at the Tap
The heater is full of hot water. Why does the hot tap run cold at first?
StartLesson 6
The Smallest Missing Connection
A tap brings clean water in. How could dirty sink water go back through it?
StartRead the whole room
Review and assessment
Lesson 9
Test: The Room Behind the Walls
Review the course ideas by applying them to new situations, with kind feedback after every answer.
Locked till you take the prior lesson