Car-free day encourages motorists to refrain from using their car for a day.  Most cities have their own websites for car-free day – here is one for the world.

World Rivers Day is a global celebration of the world’s waterways. WRD highlights the importance and value of rivers and strives to encourage increased stewardship of the world’s rivers. Go out there and adopt a river 🙂

The shadows of Europa and Callisto cross the face of Jupiter simultaneously, best seen from India and central Asia.