Molecule of the week
One molecule a week from the food, smells, medicines, household things and body chemistry people meet every day, with a line on why it is worth knowing. The newest week comes first. Follow along with the RSS feed.
This week
Week 39, 2026 · from
Cinnamaldehyde
C9H8O
Pumpkin spice has no pumpkin in it. It leads with cinnamon, and cinnamaldehyde is the molecule that makes cinnamon taste like cinnamon. from source
Past weeks
This is the first week. A new molecule arrives every Monday and this list grows by one.