So we are assigned this project for engineering and it is to design a coffee cup that would hold the highest temperature at the end of 20 minutes. You will modify a styrofoam cup and be able to use the following materials:
foam chips
plastic wrap
tape
cardboard
foil

and the cup must be uncovered w/ a minimum opening diamteter of 7cm on top.

What i plan on doing is lining the inside and outside of foil and also put a cardboard sleeve on the outside. what do you guys think?