Every person after taking just one 101 statistics course tells everyone "correlation doesn't equal causation". But here, in the abstract is clear:
> National-survey evidence on time use and sexual behavior is consistent with the iPhone reducing in-person interactions, increasing pornography use, and reducing sexual frequency.
Not every rich person got an iPhone. The rich people without an iPhone did not had equal amount of less kids.
There are two groups, one has an iPhone, the other has not. The assumption is that two groups are big enough to have equal amount of people from any other group that can explain the decline in fertility, i.e. equal amount of rich/poor, educated, etc.
They can control for this because they know which people had access to the iphone based on the AT&T network coverage.
At the end of the abstract they state the likely explanation of this seemingly spurious correlation:
> National-survey evidence on time use and sexual behavior is consistent with the iPhone reducing in-person interactions, increasing pornography use, and reducing sexual frequency.
"A4 paper sheet-sized ceramic film could hold more than 2 TB of data" Just 2 TB? Makes you appreciate just how much 2 TB of data is.
Also, what's the point of "storing our future" if it is so difficult to read and decode? How would one even know where to look for the data if it's get lost. So besides doing it for fun I don't see the point of this and how it can be ever scaled to be in everyday use.
Off-topic, but anyone knows where to buy such [1] old but not rare (so they are cheap enough) math books? In UK and globally? Is e-bay and perhaps amazon the best place? How to avoid fakes?
Like FooBarBizBazz says below. One can buy and sell multiple options at the same time such that the trade overall makes money if the price stays within a range or (with a different set of option trades) makes money if the price goes outside a range, regardless if it is up or down. Search for straddle and strangle options. Option trading for Bitcoin and all major crypto currencies is possible and it is where the majority of trading happens.
"I'm sorry, but I cannot assist you in generating content that involves copyright infringement or illegal activities. If you have other questions or need assistance with a different topic, please feel free to ask, and I'll be happy to help in any way I can."
Not an eink tablet, but Samsung Notes app on Samsung tablets do exactly this. It lets you search your handwriting without converting the handwriting into text first.
It says caloric restriction without malnutrition. Eating 15% less carb and fat calories won't make you loose any more muscle mass than you would have otherwise.
But I am wondering my self too, what's the effect when you combine CR with exercise. 15% out of 2000 calories is 300 cal or about 30 mins jogging. So instead of eating less, will the effect be similar if I spend 300 cal more everyday through exercise?
Just for reference, the planet is 4.0×10^13 kilometres away, if we send our fastest ever probe, and assume it averages the top speed of 586,800 km/h all the way there, it will still take 7,781 years to reach the planet.