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I've been using my Apple Watch's for sleep tracking every since version 0 (2 and 4). I charge during the shower and have no loss of battery life with sleep tracking on vs off.
Sleep tracking apps use the built in always on motion feature of the watch, so they add negligible battery use to calculate sleep awake patterns of movement.
So, you think Apple released this in the USA at the exact timing of the stimulus checks was a coincidence? I'm honestly surprised that Apple hasn't released a $1,199 iMac to spend the $1,200 check on. The iPad's at $499 are priced exactly at the $500 per child stimulus. Anticipating that all parents will need buy Chromebooks or iPads for their children to continue school work this year.
#1 scientists study data. Without data, they are studying the lack of data and simulating random possibilities. They typically take small sample subsets due to cost, time and availability, apply a bell curve, and just scale out the results. They use PhD level jargon to make it sound authoritative, but its Terrifying actually. Think of those small studies that proved drinking Radium was a wonder drug to cure all sorts of ailments. Or more recently, the study that showed Tryclosan was anti-bacterial led to it being everywhere in everything, and completely worthless. Leaving everyone unnecessarily exposed to past epidemics. Not to say all scientists don't know what they are doing, but recognize they need abundant information to process. Today they use peer review to see if that bell curve data matches someone else's study and give higher confidence to that lack of data. More data = better studies. better studies = better information to public policy makers. Shoving aside the ever present possibility of abuse in any technology, lets think about what scientists can do for everyone when they have bulk location data. Many scientific pathogen research studies focus on existing transportation patterns and the resulting pathogen transmission potential if nobody was aware or reacting to what was occurring. Every one of those 50+ studies I've read states they do not have enough data to accurately predict human changes to that pattern, where they go during a real event. So they provide a wide range of worst/best case possibilities to policy makers and news outlets. If scientists can see societies adaptive behavior in near real time, they can provide better information on how to influence that response to policy makers. Hyper local quarantines, focused hospital responses, targeted testing and treatments. Better distribution of supplies, and staff. When scientists can't say where, when or how bad, policy makers just do whatever activist people want them to do.