Every leaf on every plant is covered in thousands of tiny pores called stomata — far too small to see without a microscope, but they're there on almost every leaf. 

When you sealed the bag around the leaves, any water vapour from the plant leaf had nowhere to go. It hit the cooler surface of the plastic and turned back into liquid water — the same process that makes a cold glass go wet on the outside on a hot day. 

That change from vapour back to liquid is called condensation.

Here's the survival science — and this part is real:

• In wilderness survival situations, people wrap clear bags around leafy branches in full sun to collect clean, drinkable water. It's called a transpiration bag, and survival guides teach it as a genuine emergency water-collection technique. You just built one.

Think of it like this: every time you walk past a garden on a hot day and feel that cool, slightly humid air — that's transpiration at work. The plants are sharing their water with the atmosphere.

Curiosity spark: Scientists estimate the Amazon rainforest releases about 20 billion tonnes of water into the atmosphere every single day through transpiration. That water forms clouds, falls as rain, and keeps the entire region alive. 

What do you think happens to the rainforest's climate if the trees are cut down?