Once upon a time, you would have thought long and hard before you bought sneakers from a stranger in another country or rented out your home to one. So what made you feel it was safe, useful and okay? Trust researcher Rachel Botsman explains the process.

People worldwide upload more than one billlion images a day, preserving our memories so they can be enjoyed in the future. But it turns out: all our photography may be obstructing our recall, says tech podcaster Manoush Zomorodi.