Researchers figured out how to hack computers using heat

Researchers figured out how to hack computers using heat

I read article about it here and it says:

Researchers at Ben-Gurion University have created a new piece of malware called BitWhisper. Infected machines can transmit data using heat they produce. Commands, for example, can be passed from one system to another by modulating its temperature. The target machine’s thermal sensors pick up on the fluctuations and execute a predefined action. Small bits of captured data (like passwords) can also be transmitted this way.

Can you please explain how this is possible in more simple and logical terms, and how can we protect yourself from this malware?