Which material blocks Wi-Fi signals the most: wood, glass, metal, or water?. Method:

Place a device (like a phone) a set distance from the router and record the baseline signal strength.

Slide the antenna of your router through the opening in the top of the can. Use adhesive like poster tack to secure it.

Place different "shields" (a large pot of water, a cookie sheet, a wooden board) between the router and the device. Record the new signal strength for each material.

Start with a "Why is my Wi-Fi slow?" scenario and reveal the surprising things that interfere, like microwaves or even a fridge.

Investigate which common household objects are the biggest "Wi-Fi killers" by measuring signal drop through different materials.

Cut the cylinder of the can vertically down the middle and pull the sides open to create a curved, radar-dish shape.

This is a popular hands-on project that demonstrates how to focus radio waves to improve signal strength in a specific direction.