Lunar calendar was invented by women to track their periods?
There's no real basis to assume why a man would have made that calendar, and yet, quite often that assumption is made, because women tend to be forgotten.
Apparently, the periods hypothesis is not favoured for a variety of reasons... And just because counting to 28 is more useful to women than men (men and women who tracked the moon phases for millennia don't agree) doesn't make it more likely to be periods counting.
Plus the numbers on the bone are not 28 but "are understood to indicate 9, 19, 21, 11; 19, 12, 13, 11; and 7, 5, 5, 10, 8, 4, 6, 3"...
9+19=28, here it is!
LOL that's numerology, not science...