On October 31, Elon Musk plans to hold a “show and tell” for his company Neuralink. But he won’t be sharing the real stories. Away from the news conferences and carefully selected videos, Neuralink employees have been mutilating and killing monkeys in pursuit of developing a “brain-machine interface.” Like the unscrupulous showman P.T. Barnum, Musk only shows you what he wants you to see. But hundreds of pages of public records have revealed the true horrors: skulls cut open, devices implanted, chronic infections, paralysis, seizures, and death.