Internet-enabled devices are so common, and so vulnerable, that hackers recently broke into a casino through its fish tank. The tank had internet-connected sensors measuring its temperature and cleanliness. The hackers got into the fish tank’s sensors and then to the computer used to control them, and from there to other parts of the casino’s network. The intruders were able to copy 10 gigabytes of data to somewhere in Finland.

By gazing into this fish tank, we can see the problem with “internet of things” devices: We don’t really control them. And it’s not always clear who does—though often software designers and advertisers are involved.

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