President Joe Biden’s promise to reopen schools in 100 days rings hollow as the administration set the bar for fulfilling it so low the nation has met it already, according to several data sources. Reopening the schools was one of Biden’s core vows before taking office. As late as Feb. 7, he called the situation a “national emergency.” But when pressed for what “reopening” means, White House Press Secretary Jen Psaki said it would be at least one day a week of at least some in-person instruction at more than 50 percent of the nation’s schools. The 100-day window closes on April 29, leaving 44 weekdays before schools break for summer vacation. That means at least half the students have been promised at least 10 days of at least some in-person instruction. However, as of Feb. 10, more than 40 percent of K-12 students were already attending schools that offer …