Giant bubbles 
Aren't these fantastic!
Just imagine the fun your class could have and the questions that would be generated.
Can we make a stronger mixture?
Does it still work on a windy day?
Can you make other bubbles inside the big one?
Why does humidity make a difference?
The friend who sent the photos said..
"It was only 70% humidity, higher humidity gives better bubbles - we had trouble closing off the bubbles that day, without them popping."
If anyone else has ideas or photos of things they have tried please send us an email discoveryt@gmail.com and I'll put them up (just make sure you have permission for children's photos). We're always looking for new material so would love to hear from you.