It's the kind of stuff that got me into programming. I never worked in this space but it was a huge inspiration. I used to buy cdroms that were dumps of certain website like drdobbs and alike
I really hate this "markets are efficient" bullshit. The markets are too slow because they don't incorporate the true cost of stuff. The environment is going to shit and by the time the markets have incorporated that cost, it is too late.
LTE will give you a datapoint roughly every 2 minutes. Accuracy will depend on the density of the LTE towers (150m - 2km). So besides Google, FB, etc. Telecom operators also play a role in this space. Remember that GPS might not always be turned on while your phone pinging cell phone towers happens all the time.
With future 5G implementations this accuracy will be even further increased because the antenna range is short and the density will be much larger.
I suspect that people wear masks as protection and linger around in closed of spaces too long. Masks are probably good for suggesting big aerosols but the small ones will linger in the air.
There is also the difference with me having been patient for some pay off this population to come to terms with their stupidity and pfft. Vax or go to space
Really they should have fertility checks included in basic insurance for women over 30. I'm at an age where I see many women struggling to conceive because they waited to long. Knowing where you are at fertility wise at 30 gives people the chance to decide what they want to do in life