Video shows metal beams falling like dominoes

Dangerous moments were caught on camera last week at a construction site in Boston.Video shows a metal beam falling toward one side, toppling neighboring beams like dominoes. Meanwhile, workers below scrambled to get out of the way. It happened Friday on the 600 block of Commonwealth Avenue, where Boston University is building a new Data Sciences Building on the site of a former parking lot.The building design includes a four-story base and a 13-story tower intended to resemble “a