In a video obtained by MSNBC’s All In with Chris Hayes, Bill Gates reveals that while meeting with Donald Trump at Trump Tower in December 2016 — and another time in March 2017 — the president asked him if HIV and HPV were the same thing.

After you slap yourself across the head from shock, continue…

“Both times, he wanted to know if there was a difference between HPV and HIV,” he said in the clip. “So I was able to explain that those are rarely confused with each other.”

The Human Papillomaviruses (HPV) can be sexually transmitted and infections are very common with relatively few people [having] lasting health effects. But HIV is a virus that corrupts the T cells of an HIV-positive person, and can lead to stage 3 HIV (or AIDS). While there is no cure, there is treatment that can lower the viral load to such low levels that makes it makes them undetectable (or “untransmittable” to another person).

Exclusive footage obtained by All In… Bill Gates dishes on his meetings with Donald Trump. More tonight at 8PM ET. #inners pic.twitter.com/Zoehj1WTfk

— All In w/Chris Hayes (@allinwithchris) May 17, 2018

“In both of those two meetings, he asked me if vaccines weren’t a bad thing because he was considering a commission to look into ill effects of vaccines,” recalled Gates, who also revealed he once  “avoided” Trump when the two were in the same place during the election.

Never before seen footage obtained exclusively by All In shows Bill Gates discussing meetings with Donald Trump #inners pic.twitter.com/GouJwYKghi

— All In w/Chris Hayes (@allinwithchris) May 18, 2018