The science of materials is generating strong pressure towards big changes of direction. One of the most recent ones seems destined to generate a conflict between calcium mines and eggs. Ivan Cornejo, a Chilean researcher who lives in the United States, has studied the environmental damages produced by calcium mines, for example in Asia, and has worked on a potential alternative: extracting calcium from egg shells that end up in the rubbish. He also discovered that different types of glassy materials can be recovered from food waste: nutshells, banana skins and corn. It is true, it seems strange that we move from mines to the vegetables that we find in markets, but we should not be surprised. The universe is immense but when we fix our spectroscopes towards far away cel...