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TIL that despite the second X chromosome being thought of as totally inactivated in XX cells, ~15% of genes escape silencing. These same genes are present on the Y chromosome, ensuring they are always bi-allelically expressed.

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E5DW TIL Roger Sherman is the only person to sign all four great state papers of the United States: the United States Declaration of Independence, the Articles of Association, the Articles of Confederation, and the United States Constitution.
awB4Z TIL that to apply to become a communist party member in China, you need to write periodic "thought reports" for two years, detailing your opinions on society and about your personal life. Additionally you have to attend classes once a week for three months and pass a final exam.
LVnV TIL Dave Navarro’s mother was murdered by her boyfriend, John Riccardi, who was arrested thanks to a viewer tip after Navarro appeared on America’s Most Wanted.
wLM08 TIL that the first editions of Moby Dick omit the epilogue and move the extracts to an appendix. The plot holes created by this caused the book to flop on release.
4XLpg TIL that India has more vegetarians than the rest of the world put together.