No matter how invasive the technologies at their disposal, marketers and pollsters never come to terms with the living process through which people choose products or candidates; they are looking at what people just bought or thought, and making calculations based on that after-the-fact data.

As a digital technology writer, I have had more than one former student and colleague tell me about digital switchers they have serviced through which calls and data are diverted to government servers or the big data algorithms they've written to be used on our e-mails by intelligence agencies.

Everything we do in the digital realm - from surfing the Web to sending an e-mail to conducting a credit card transaction to, yes, making a phone call - creates a data trail. And if that trail exists, chances are someone is using it - or will be soon enough.

The reason why Apple computers have worked so well over time is that, unlike Microsoft, they don't bend over backward to be compatible with every piece of hardware or software in the digital universe. To code or create for Apple, you follow Apple's rules. If you're even allowed to.

With the DVR, I was mostly writing about it as a good thing in giving us the choice of when and how to watch things. But there's what we lose in the bargain, which is the collective spectacle. 'Did you see Jay Leno last night?'

I don't know of any other form of life that gathers up all the food it needs in the first two-thirds of its life in order to do nothing in its last third of life. In a utopian presentist society, instead of working extra hard to put money in the bank, you'd be working to provide value for the people around you.

Invest in people who will take care of you when you're old.