Many commenters said the Redditor's sister did not try to comfort or ease her son's fears in any way.
Tributes have poured in for Mayer—known for her love of science fiction, comic books, and cats—with one co-worker saying: "She was the best of us."
Scientists hope their research will help us understand conditions like dementia.
About 30 million people per year are exposed to the chemical.
Celebrity conservative and living meme Chuck Norris is suing a medical company for allegedly poisoning his wife with gadolinium, a chemical commonly used in MRI machines.
Researchers will be able to improve understanding and diagnoses of diseases such as cancer and dementia.
"We are making progress against this Voldemort of parasites."
Tracking emotional brain activations can help single out patients with the best chance at responding to experimental treatments.