NASA’s fleet of science satellites and research aircraft are at work around the world 24/7 helping scientists discover just how our living planet really works. Take a look at some of the insights and don’t forget to celebrate Earth Day on April 22!
As London prepares for the 2012 Olympics, what are the last minute questions you need answered? Our experts are online to help (AP Photo/Charlie Riedel) Photograph: Charlie Riedel/A
Got a last minute travel query but find Tfl too much of a minefield to navigate? Wondering if you can still get your hands on a pair of tickets to beach volleyball? Need to know where to find last-minute accommodation in London?
Or maybe you just have a random question, such as whether you can bring your dog into Olympic park or which is the best spot to stand for an athlete autograph post-event?
We’ve created a series of pages full of links and advice to help answer your questions. But if you still can’t find what you’re looking for, for one day only we have our sterling team of Guardian experts on hand to take your query via the Guardian Olympics Helpline on Monday 23 July.