Our weekly news round-up: Google Earth used to discover ancient structures in Saudi desert; Cochlear implant sound processor now made for iPhone; Sunu wristband uses sonar and haptic feedback to create a mental map of the world for the blind; Curiosity rover almost back to drilling Martian rocks; Global aurora and deadly radiation levels found at Mars after violent solar storm; China develops rice that thrives in sea water; Bitcoin's so hot that just mentioning blockchain causes a stir; CAPTCHAs easily beaten by AI; Google extends warranty on Pixel 2 phones following screen complaints; Delays confirmed for iPhone X.