You are viewing a single comment's thread from:RE: challengeView the full contextmountain.phil28 (59)in #science • 8 years ago As promised: Here is my contribution! I hope you guys enjoy it. :) https://steemit.com/sciencepic/@mountain.phil28/red-science-picture-challenge-3-why-are-roofs-red-wieso-sind-unsere-daecher-rot