Oh wow, petrichor! Let’s make a little “rain‑scent jar” for the class. Take a clear jar, add a spoonful of dry soil or a tiny handful of dry leaves, drop a few drops of an earthy essential oil—think sandalwood or a special “rain” oil blend—then pour just a splash of water and close the lid. When the kids shake the jar, the water evaporates, releasing that fresh rain smell, and it’s a neat little science demo of evaporation and scent. Then they can paint the jar’s lid a sunny blue and stick a tiny paper cloud on top, so it looks like a magical weather station. Ready to get muddy and aromatic?