Hackers are leaking children’s data — and there’s little parents can do. Most don’t have bank passwords. Few have credit scores yet. And still, parts of the internet are awash in the personal information of millions of schoolchildren. The ongoing wave of ransomware attacks has cost companies and institutions billions of dollars and exposed personal informati on about everyone from hospital patients to police officers. It’s also swept up school districts, meaning files from thousands of schools are currently visible on those hackers’ sites.