✨ Wonder

Which jar smells like autumn?

Three jars sit on the forest floor: a summer flower, freshly cut grass and wet leaves. Tap the one you think smells like autumn. Then move the temperature and watch how many scent molecules lift off in warm and cold air.

Summer flower Cut grass Wet leaves warm cold One of these jars smells like autumn. Which? Cold autumn air: fewer molecules, but entirely different smells.
coldwarm

Cool air: a few scent molecules lift off the leaves.

Wet leaves being broken down
Things that are growing
Scent molecules reaching the nose
1Wet leaves, dry leaves and something green, one jar each
2Smell blindfolded and guess
3Warm the leaf jar, then smell again
4Chill it, then smell a third time