Google Nose!
Google Nose !!! Awesome !!! What’s that smell? Google Nose BETA leverages new and existing technologies to offer the sharpest olfactory experience available: Street Sense vehicles have inhaled and indexed millions of atmospheric miles. Android Ambient Odor Detection collects smells via the world's most sensible mobile operating system. SMELLCD™ 1.8+ high-resolution compatible for precise and controlled odors. source from: http://www.google.com/landing/nose/index.html APRIL FOOLS!