Your body / DAY 33 OF 40
A trillion smells? Let's inspect that number.
One famous estimate became a lesson in how science checks itself.
Here's the strange part.
A trillion smells is a headline with excellent advertising instincts. A 2014 study estimated that scale by extrapolating from people's ability to distinguish odour mixtures. Later critiques challenged the mathematics and assumptions behind the leap. That does not hand us a neat replacement number. It shows why the bridge from an experiment to an enormous claim deserves inspection. (California Institute of Technology)
The total number of odours humans can distinguish remains undetermined by this evidence. Discrimination is also different from identifying or naming a smell.
REALITY CHECK · TRUE OR FALSE?
A trillion? Let's ask the calculator.
The critique establishes a precise replacement total for distinguishable smells.
Go straight to the receipts.
Curious about the methods, dates or details? Open the original source and keep the caveat in view.
ORIGINAL SOURCECalifornia Institute of TechnologyOpen publication ↗NEXT IN THE 40-DAY TRAIL / DAY 34Meet solid smoke. ↗