Will having longer, healthier lives be worth losing the most basic kinds of privacy? John Harris

The deal has yet to be approved by the relevant regulators, but Google has got most of the way to buying Fitbit – the maker of wearable devices that track people's sleep, heart rates, activity levels and more. And all for a trifling $2.1bn (£1.6bn).The upshot is yet another step forward in Google's quest to break into big tech's next frontier: healthcare. Last month, in a Financial Times feature about all this, came a remarkable quote from a partner at Health Advances, a Massachusetts-based tech consulting company. Wearables, he reckoned, would be only one small part of the ensuing story: just as important were – and no guffawing at the back, please – "bedside devices, under-mattress sensors, [and] sensors integrated into toilet seats". Such inventions, it was explained, can "get even closer to you than your smartphone, and detect conditions such as depression or heart-rate variability".