I built a fortress of foil and trapped my Wi-Fi router inside (here's how it went)

I grew up "borrowing" all sorts of things from the kitchen for my childhood arts and crafts -- bare paper towel rolls, empty cereal boxes, and (to my parents' dismay) yards upon yards of aluminum foil. I'd bend and mold the sheets into makeshift bowls and pretend metal walls. That crafty kid would be overjoyed to know she'd still be bending foil in the kitchen years later -- only this time, as a real part of her job.

Source : https://www.pocket-lint.com/can-aluminum-foil-block-wifi/