San Francisco's California Academy of Sciences is rolling back its operating staff and salaries amid the Covid-19 shutdown. The Academy announced this week that it will start layoffs, furloughs and reductions to salary and hours affecting 75% of the institution’s 504 employees. Specifically, 105 employees will be laid off, 96 will be furloughed, 165 will receive salary reductions and 11 will receive a temporary reduction in work hours, according to the announcement by Executive Director Scott…