I wish I could play around with Spanner for personal/side projects, but a production ready instance starts at $65/mo. DynamoDB can run for ~$0.00/month with per-request pricing.
if you are interested in spanner, you might take a look at cockroachdb. esp the production ready serverless offering which is pay for consumption only. crdb architecture is essentially spanner under the bonnet, GIFFE
My favorite Grace Hopper fact nobody seems to know: She was an early Mark I programmer and was tasked with compiling a book on how to program the machine. (IOW how to punch the right holes in the paper tape to then feed into the machine). This was the world's very first computer manual. (I go back and forth over whether this was a good thing)
Neanderthals probably did have some form of language since appear to also have had a gene that is crucial to language in humans. And they buried their dead. So why would we presume they didn't make some sort of marks intentionally, to convey meaning or just to decorate their favorite rock?