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Things required: 2 Paper Cups, Strings and Needle or a sharp object to make holes in the cups. Source: paksc.org. Image source: img.ehowcdn.com
Make a small hole at the bottom of each cup. Image source: stevespanglerscience.com.
Tie the strings to each of the cups and tie a knot at the end of the cups to make sure the strings are attached to the cups. Image source: scientificamerican.com.
You will require another person to hold one of the cups and move to distance that makes the string tight. Image source: brandzwantstobefriends.com
Your string phone is ready! Test your phone by hearing to what the person is talking. Does it work? Well, your string phone is ready! Image source: a2.mzstatic.com