im a layman. what are things people still act like or think as science fiction that is 100% true?

i already know about animal human chimeras
https://www.the-scientist.com/news-opinion/first-humanmonkey-chimeras-developed-in-china--66231

clones
https://en.wikipedia.org/wiki/Dolly_(sheep)
https://en.wikipedia.org/wiki/Commercial_animal_cloning#Livestock_cloning

time is weird as shit and relative
https://en.wikipedia.org/wiki/Hafele%E2%80%93Keating_experiment

im fairly sure this proves alternate realities or at least shows that particles can be paradoxical
https://en.wikipedia.org/wiki/Double-slit_experiment