Lenovo Yoga Tab 13 is a tablet that doubles as a portable screen

Ahead of the Mobile World Congress in Barcelona, which kicks off on Monday, Lenovo has launched a bunch of new Android tablets, as well as a versatile smart clock.

The most interesting among these new devices are the Yoga Tab 13 and Yoga Tab 11 — Android tablets with built-in, stainless steel kickstands that can double as...