Second, we needed a shareable moment that made the value proposition tangible to users. So we did something audacious: We added a survey that predicted your death date—and projected what you would look like as you age. This viscerally showcased the impact of changing your habits—and provided personalized content to... See more

"Long ago, before the Great Clock, time was measured by changes in heavenly bodies: the slow sweep of stars across the night sky, the arc of the sun and variation in light, the waxing and waning of the moon, tides, seasons. Time was measured also by heartbeats, the rhythms of drowsiness and sleep, the recurrence of hunger, the menstrual cycles of... See more