Okay, it's weekend - time for some fun! Curiosity spotted an interesting looking piece of metal on Mars. What is it? We'd like YOU to tell us. You have until Monday morning 10:00, GMT+1 to come up with the answer. How to enter Model the Martian Mystery, upload it to your gallery, tag it with 'Weekend Contest: Mars' and post the link and picture here (upload the image, and click 'Insert image into message body' to embed it in your forum message). Who wins? You decide! Visit the model that you like most, and add it to your favorites. The model with the most votes wins. What's the prize? Eternal fame! Kudos from the Shapeways team! Riches! Okay, well, the winner will get a $25 gift certificate. That's all? Yep, grab a drink, goof around in your favorite modeling app this weekend and have fun! Bart PS: Curiosity's Twitter feed is awesome.