I've been doing classical physics and specific heat so I started wondering why some materials cool and/or heat faster, I figured it probably had something to do with how close together the atoms were in the material or such... than i started thinking why are matters like Iron always so cold when you touch them, but not a pencil or wood? I was thinking it's specific heat is different but I figured they tought us that heat spreads evenly, just at different speeds..? One thing I guessed was that the iron atoms are closely packed so any kinetic energy can be transferred trough it easily and back out again the other end like a shock wave, but it didn't quite cut it... I just don't really get it... seems classical physics can be more complicated than quantum mechanics sometimes. Anybody care to elaborate why hard materials tend to be cold, or what the properties of cold materials tend to be.. is it just specific heat?