TinEye is a great reverse image search online service, that can tell you where an image came from, find different sizes of the image and you can find out if someone is using your image without your permission.
To avoid using someone else's copyright protected images you aren't allowed to use for commercial or even personal use, Google Advanced Image Search has got you covered.
Half a million Lego pieces put together in an amazing life size air powered car that is able to reach speeds up to 20 mph, how incredible does that sound?