You can use aluminum foil to strengthen your Wi-Fi signal

Wi-Fi signals are ubiquitous, but even though they’re invisible to us, the materials they interact with still affect them. These electromagnetic waves can travel through wood, glass, or concrete, but not water, so—pro tip—don’t put a fish tank in front of your router. Then there’s metal: it reflects the waves, a fact you can even take advantage of to shape the Wi-Fi signal in your home.

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