The boys' club still exists.
And if you're a woman, you'll be nodding along to nine out of 10 of them.
The hashtag started after it was revealed that 22-year-old Elliot Rodger, lead suspect in the Isla Vista shooting, had shared extremely disturbing and misogynistic views in a video posted shortly before the attack.
Instead of flooding the internet with Rodger-specific fury, Twitter took the discussion to the next level and remind the world that sexism is still very much present across society, and #YesAllWomen experience it.
Among those tweets were many honest and confronting admissions of sexism from female scientists, students and communicators.
This isn't the first time the issue of misogyny in science has been brought up, but it's always sad and shocking to see certain opinions persist when females have come such a long way in the field.
Here are some tweets that made us stop and think:
As ScienceAlert is staffed almost entirely by women, we though we'd add a few of our own:
Because only 44 out of 835 Nobel Prize laureates are women.
Because senior scientists would still rather hire males, and pay them more.
Because people are still shocked when we tell them ScienceAlert is run by women.