The Daily Matter | Sunday Science

This Sunday:

• Kerry Sheridan tells us about four-winged birds and what scientists think they used those extra "wings" for.
• Your brain may have more than 150,000 kilometres of nerve fibres, and mapping them might help us unravel the mystery of the mind, says Martin Williams.
• On the topic of brains, there's new technology that can tell you if you have Alzheimer's long before the first symptoms start to show. It's neat, and the folks at the SXSW music, film and technology conference agree. 
• Finally, in Short Science, Europe and Russia are planning a joint mission to Mars; Lockheed Martin finds a cheap way to make seawater drinkable; and after veterans raise a stink, medals won't be awarded to military personnel in drone and cyber warfare just yet.