The previous page is sending you to https://www.dw.com/es/casi-el-20-de-acad%C3%A9micos-en-ee-uu-dice-haber-visto-un-ovni-o-conoce-a-alguien-que-lo-ha-visto/a-65906287.

 If you do not want to visit that page, you can return to the previous page.