I like it, but the switch from metric to inches is confusing, and I think introduces a bug - there's no way a sea snail is 5-6 neurons high.
You can change the units in the top corner. It defaults to metric for me, but if your browser language is "en-US" you get imperial by default.
Some of your neurons stretch from your brain to your big toe. 1.5m, or more in a tall person.