A video showing an unusual optical illusion around Denali, North America’s tallest mountain, has gone viral on TikTok. The video, posted on January 2 by TikTok user @ak_amy_mae, has amassed 6 million views and was recorded in Anchorage, Alaska’s most populous city. In the clip, a voice off-camera expresses astonishment at the scene, saying, “It is so weird…it’s like Denali is melting.”…