Whether you're a teacher, a parent, or just someone with a big family, you know how difficult it can be to keep a room full of kids quiet for any amount of time.

One trick I've used is offering to time how long kids can stay quiet. For reasons I don't understand, kids love it when something is being timed. But that only work a few times at the most, so it's good to have as many other tricks on hand as possible. That's why I was fascinated to learn there are multiple websites that use the microphone on your laptop to motivate kids to be quiet. Some put children's curiosity to work, having animated characters show up if the group is quiet for long enough. Others combine animation with good old-fashioned timers.

Here are a few you can check out—all of them are completely free and don't requ

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