Yes, that’s me. What else is in aspirin?

Stuff that allows it to form a solid block instead of powder. Stuff to time how long it takes to dissolve (how else can there be fast-acting and slow-acting versions?) Stuff to make the pills large enough to see with your eyes. A grain of sand is about 20 milligrams. Low-dose aspirin is 80 milligrams, but the pill is a much more convenient size than 4 grains of sand. (or 8 grains of sand, since sand is about twice as dense as pure ASA)

A 20mg grain of sand is either not a grain or not sand

Doing the conversion - 20 milligrams is 0.308647 grains So you're correct.

(had to use Google - I only know that there are 7000 grains to the pound)

I am GP and did more research and need to post a correction but it's too late to edit my former comment.

The grain, in terms of weight, is 64.8 milligrams, or much more than a even a course grain of sand, which it turns out, is somewhere around 1 milligram, ranging from 0.04 mg for fine sand to 4 mg for very course sand, average around 0.3.

Excedrin brand in the US has tablets with caffeine and aspirin, for example, but people might just call them aspirin (my grandmother, for example).