444 - The Sweetness of Death in Autumn

"Something smells nice right here," commented my fiancé as we hiked over a rock outcrop strewn with sun-warmed, yellowed birch leaves. The sweet aroma of autumn comes when microbes break down sugars that trees manufactured in the height of summer. Before letting them go, the tree pulled nitrogen and phosphorus out of the leaves and into the twigs, where the molecules will remain on deck to fuel next spring's leaf growth. But the tree doesn't need to save every last molecule of sugar.