Good coffee doesn't just require hot water, it also needs pressure. See how these specialist machines are designed to deliver the perfect cup of joe. MACHINES: HOW THEY WORK Thursdays 10/9c on Science www.sciencechannel.com/tv-shows/machines-how-they-work/ Subscribe to Science Channel: bit.ly/SubscribeScience Facebook: www.facebook.com/ScienceChannel Twitter: twitter.com/ScienceChannel