Epic Quest Bio The case files
Case No. 3 · have you seen this molecule?

Geosmin

the smell of rain on dry earth

File sealed

The detectives are still writing this one up. The poster and the facts are below; the film and the interrogation room open soon.

Booking photographs

Geosmin, front view, against a height chart in nanometers
FRONT
Geosmin, side view
SIDE · CID 29746

The suspect, from its real atomic coordinates. Drag to turn it. Height chart in nanometers, ruled every 0.05 nm. About 100,000 of them end to end would span the width of a human hair.

Rap sheet

Answers to
Geosmin. You know it by its smell.
Height
0.72 nm. Compact.
Weight
0.30 zeptograms
Build
Two rings joined along one side. Stocky.
Smell
Rain on dry soil. Beets. Most noses catch ten parts per trillion.
Habits
Made by soil bacteria to lure springtails, which leave carrying their spores.
Weakness
Loses its smell in acid.
Last seen
A 5 mL tube marked BEET in the fridge at HQ. Mostly in the skin.
2,600,000,000,000,000

of them in one small raw beet, skin on. Beets vary.
You’ve never seen one. You’ve smelled plenty.

The poster on the street

The wanted poster for Geosmin

This is the photocopied wanted poster for Geosmin, No. 3. They were made for noticeboards around Boston, Cambridge and the rest of the east coast.

Found one? Scan its QR code with your phone. If you're a signed-in player, the sighting goes on your record with +1 XP.

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