Internet

Artists cash in on China's online sticker craze

When "Silly Piggy" appeared in China's popular WeChat social media app, the sticker became an instant hit, with people sending it more than 30 million times in its first month to express their feelings in text messages.

Engineering

Wireless sensors stick to skin and track health

We tend to take our skin's protective function for granted, ignoring its other roles in signaling subtleties like a fluttering heart or a flush of embarrassment.