Can people interfere with the wireless signal?

This is strange and I can't figure it out. My Linksys WRT54GSv5 router works fine with my notebook accessing the internet. When certain friends of mine come over, the wireless internet quits working the minute they enter my kitchen, that's where my notebook computer is. I'm connected to the wireless network, but no web pages will load. When they leave, everything works again without rebooting or anything. Is there an explanation for this?

This has happened 4 times in a row when they came over. Yesterday, while they were walking up to my house, I tried to load a web page on my notebook and it worked fine. The minute they entered the kitchen, I tried a web page again and it would not load. I wonder if there is a device that may interfere with the wireless signal that they have with them. There was no microwave in use. As far as I know, my friends are not robots. But maybe they are aliens from another planet. Seriously, I can't figure out why this is happening.

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Can people interfere with the wireless signal?

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