Mammatus, or mammatocumulus, is a name for "pouch-like" patterns that hang from the base of clouds. They're often seen during severe weather events. Here are five photos of mammatus clouds, as sent in by you.
Volcan-ado spotted in Iceland
Something very interesting was captured in Iceland - a volcanado?
The Franklin Expedition: What we didn't know
What you need to know about the incredible journey of Franklin and his crew.
Introducing the 'smart' wheelchair
Intel's newest Internet of Things project will open the world to wheelchairs.