With millions being vaccinated against Covid-19 every day, some political and business leaders are suggesting nations can help get life back to normal by rolling out a so-called vaccine passport: an easily accessible and verifiable certification that a person’s been inoculated. Private companies are already beginning to look at making shots mandatory for people who want to get on planes, cruise ships or attend events such as concerts. A handful of projects from governments, private firms and international associations are currently underway. But the idea raises scientific and ethical questions.
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1. What’s the idea behind vaccine passports?
At the…