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There are four types of fish scales!

Cycloid scales are thin, overlap, and flexible. They're found on primitive teleosts (like minnows and carp).

Ctenoid scales have small, backwards pointed scales (known as cterns) make the fish more hydrodynamic and faster. They're found on Advanced Ctenoids (like perch and sunfish).

Ganoid scales are thick, diamond-shaped, and mostly non-overlapping. They're found on Chondrostei (like sturgeons and paddlefish).

Placoid scales are spikey and tooth-like with nerves. These are found on Chondrichthyes (like sharks and rays).

Ichthyology Notes 3/?

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My T-shirt with the entire text of Borges' theoretical Library of Babel is raising a lot of questions already answered by the shirt, somewhere.

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my friend took in a stray and she’s the cutest kitty ever but he named her oil so whenever he sends a picture of her me and my other friends look like we’re roleplaying as the US military

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First ever recorded snowball fight (1897)

Happy Holidays And Merry Christmas To All!

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Hello tumblr I heard you like changeling stories

Edit: If you want a physical copy of this comic!

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this is it. this is the funniest scooby doo clip

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when adults tell teenagers that the dull ache of high school is just a survivable mess that they’re making up to be worse than it is, i think of this:

when i was in sophomore year, i was in an accident and the left side of my face was hit. i sat in the emergency room with a clearly broken nose and blood coming out of a laceration on my cheek. and i did my homework. i did my homework with a black eye swelling up, with little red fingerprints on it. 

and he told me to redo it. that it wasn’t good enough. the assignment itself was worth maybe five points out of a hundred. he wouldn’t forgive me for it. when i explained about my concussion, he told me to do it somewhere dark.

we don’t make it up. the value of our lives becomes almost nothing at all. the quality of living that is allowed is so low that students learn to apply it to themselves. they are useless, unimportant, a machine to figure out problems without any food, sleep, family time. nothing. we call teenagers moody because something in them breaks a little. we don’t say: they are stressed beyond measure and they believe their own physical health is less important than the quality of the product they’re forced to produce. we don’t say: wouldn’t you be moody too?

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got cream🤍🤍

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normalise being bad at roofs in minecraft. normalise not being able to make an aesthetically pleasing roof to save your life in minecraft.

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Some individuals with AD/HD, especially without hyperactivity, have an activation problem as described by Thomas Brown, Ph.D. in his article AD/HD without Hyperactivity (1993). Rather than a deficit of attention, this means that individuals can’t deploy attention, direct it, or put it in the right place at the right time. He explains that adults who do not have hyperactivity often have severe difficulty activating enough to start a task and sustaining the energy to complete it. This is especially true for low-interest activities. Often it means that they can’t think of what to do so they might not be able to act at all, or, as Kate Kelly and Peggy Ramundo say in You Mean I’m Not Lazy, Stupid or Crazy?!, they might experience a “paralysis of will” (pg. 65). “The clothes from my trip—a month ago—are just still lying in a heap in the suitcase.” “I spend a lot of time in bed watching TV but my mind isn’t watching TV. I’m thinking about what I should be doing, but I don’t have the energy to do it.”

- Sari Solden, Women With Attention-Deficit Disorder