Washington: The hoax that rape was legal for a day was knocked down by fact-checkers two years ago. But it went viral again this year on TikTok, illustrating what researchers call “zombie” misinformation. The stomach-churning falsehood that groups of men have declared 24 April as “National Rape Day,” giving them free rein to commit sexual violence, crept its way to TikTok fame in 2021, sparking alarm in countries including the United States and Britain. In a sea of videos, many with millions of views, terrified women declared plans to lock themselves in their rooms all day and men vowed to…