Do you wish you could attend a live music performance sometime soon? If you have received a coronavirus vaccine in some countries, you might be able to. It usually takes a ticket to gain entrance to a music performance. But in some countries right now, you need more than that. You need a “green passport” which proves that you have already received a vaccination. Green passports are already being used in Israel, Greece and Cyprus. Those countries on the Mediterranean Sea are working together to open their economies and honor each other’s green passports. Similar agreements are expected to be used in other nations to boost the number of foreign visitors.