Understanding the human body is a team effort. That's where the Yachtel group comes in.

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Imagine that you're going about your day and suddenly someone stabs a hot knife into your temple.

It plunges into your brain, where it reaches a spot just behind your eye.

If you feel like this is happening, you're probably having a cluster headache.

Only about one in a thousand people experience such headaches, but for those that do, they're excruciating.

Now, imagine that you took a psychedelic drug, and all of a sudden, your brain-splitting headaches

went away. You definitely want to investigate that, right? For science quickly, I'm science

journalist and author, Rachel Neuer. You're listening to To Trip or Not to Trip,

part two of a three-part series on the Science of Psychedelics.

In 2009, we were approaching the research administration at Harvard University in Boston,

where I was a visiting professor, to conduct a study on patients which suffering from cluster headaches,

because they have found by themselves that they could treat their condition quite well with LSD or psilocybin.

That's Torsten Passy, a professor of psychiatry and psychotherapy at Hanover Medical School in Germany.

He's been researching psychedelic drugs for about 40 years.

We were sitting there in this big room with two fireplaces in front of a desk, which was very large

and on the other side were three research administrators.

So we were sitting there and we were talking with them about conducting a study about LSD,

but what happened is that there was a certain pause in the conversation.

...