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TIL scientists once swapped DNA cells between a human zygote and a mouse zygote to see what would happen. While the mouse zygote was able to reprogram and become a mouse, the human zygote "soon died" in every attempt, with no clear view on what would form.

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nwYd TIL that there Are Whales Alive Today Who Were Born Before Moby Dick Was Written
Vo0G TIL that the company that produced the original Tomb Raider game wanted to include a nude cheat for Lara Croft but Toby Gard the lead designer refused to do this
OGeL TIL that when &%#@$ replace profanity with a #&@%ing string of typographic symbols it’s called a grawlix
O08R TIL That the current US flag was designed by a 17 year old who originally got a B- grade for it.
Bg6or TIL the earliest recorded known use of the arrow symbol (“→”) was in 1737