This is a secret Google system that tracks many factors to decide whether you’re a human or a computer. Some important factors seem to be your IP address, your browser, and how quickly you click the mouse. If it’s sure you’re a human, it just lets you through and clicking the box is a formality. If it isn’t sure, you’ll get a traditional test where you have to click on pictures. It’s also possible that it’s sure you’re a bot, which I’ve experienced at least once, and it won’t let you pass at all.
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