Octopuses Don’t Have Tentacles

Entomology student Dalton Ludwick once asked scientists on Twitter: If you could have the entire world know something about your field of study, what would it be? The hashtag #MyOneScienceTweet was born, and it was glorious.

If you could have the entire world know just one thing about your field of study, then what would it be? #MyOneScienceTweet

— Dalton Ludwick, Ph.D. (@EntoLudwick) October 27, 2017

Ichthyosaurs and Pterosaurs are NOT dinosaurs.

But this guy: ???? and ???? and ????and ????and ????and ????ARE all dinosaurs.#MyOneScienceTweet https://t.co/fg7NB1ryrU

— Dr Thomas Clements (@Thomas_Clements) October 30, 2017

Birds are dinosaurs, but pterosaurs aren’t. Mind blown, right? Here’s the one about octopuses:

Octopus don’t have any tentacles. 0. Not one. They have 8 arms. ????

Squid and cuttlefish have 8 arms AND 2 tentacles. ????#MyOneScienceTweet https://t.co/fg7NB1ryrU

— Dr Thomas Clements (@Thomas_Clements) October 30, 2017

There are important science facts about people, too:

Anthropologists did not stop using biological “race” to be politically correct, they stopped because it is bad science #MyOneScienceTweet https://t.co/M9kLLxpbT8

— Tina Lasisi (@TinaLasisi) October 29, 2017

#MyOneScienceTweet : people did live to their 70s, 80s, 90s in the distant archaeological past; just not as many as today

— Dr Christine Cave (@christinecave5) October 30, 2017

And physics:

Turning a lightbulb on means something somewhere is spinning a little slower. #MyOneScienceTweet

— Scott (@Scotty_McQ) October 30, 2017

U r constantly bombarded with radio waves from distant galaxies & u are going to die. These facts are not related. #MyOneScienceTweet

— Little Jimmy Sky (@sky_jim) October 30, 2017

And everything else:

All data returned by solar system spacecraft belongs to the public and most of it is available for free via the Internet #MyOneScienceTweet https://t.co/tHq0qOTjTk

— Emily Lakdawalla (@elakdawalla) October 29, 2017

Sharks are not a threat to humans, and humans are better off with healthy shark populations than we are without them #MyOneScienceTweet ???? https://t.co/84avMfdBjo

— Dr. David Shiffman (@WhySharksMatter) October 28, 2017

There are over 200 different types of cancer. There isn’t going to be one ‘cure’.#MyOneScienceTweet

— Dr Vicky Forster (@vickyyyf) October 28, 2017

There is a species of sea slug that smells like watermelon #MyOneScienceTweet https://t.co/2dCC4p1bOO

— seahorse foster dad (@phycofrenzy) October 29, 2017

For more excellent science facts you should stash away in your brain right this instant, visit #MyOneScienceTweet on twitter. You’re welcome.

This story has been updated since its original publication.