this post was submitted on 20 Jul 2025
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Science Memes

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The Brachinus crepitans, or bombardier beetle, measures just 2 cm but wields a powerful chemical defense. When threatened, it mixes hydroquinone and hydrogen peroxide inside its abdomen, triggering an exothermic reaction that reaches 100 °C. It ejects bursts of corrosive benzoquinones at 500 pulses per second, burning and repelling predators. This precise, repeatable mechanism has inspired research into reigniting gas turbines in aircraft under extreme conditions as low as –50 °C. Its internal valve and chamber system is now studied in chemical engineering and advanced biomimicry.

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[–] oftheair@lemmy.blahaj.zone 20 points 2 days ago* (last edited 2 days ago) (1 children)

[Teasing] 212°F is 100°C, for anyone or anymany using proper measurement systems for temperature.

[–] sin_free_for_00_days@sopuli.xyz 12 points 2 days ago (2 children)

Or about 373° Kelvin for the truly enlightened.

[–] I_am_10_squirrels@beehaw.org 9 points 1 day ago

Or about 672 Rankine for the truly deranged

[–] OddMinus1@sh.itjust.works 14 points 2 days ago (2 children)

Or 0° Delisle if you just want to flex about knowing obscure temperature scales.

I don't think Kelvin is an obscure flex, but I had never heard of Delisle. That is a weird one! Thanks for sending me down a little rabbit hole.

[–] beejboytyson@lemmy.world 3 points 1 day ago

Yes that is a flex tbh

[–] setsneedtofeed@lemmy.world 128 points 3 days ago (2 children)

I'm from Buenos Aires, and I say kill 'em all.

[–] Mothra@mander.xyz 25 points 3 days ago (2 children)

I'm from Buenos Aires and didn't know about the existence of this meme

TIL

[–] teft@piefed.world 4 points 2 days ago* (last edited 2 days ago)

You have to watch Starship Troopers. One of the best satirical military action films of all time.

[–] Tar_alcaran@sh.itjust.works 14 points 3 days ago (2 children)

You should watch Starship Troopers.

[–] Mothra@mander.xyz 7 points 3 days ago (2 children)

After knowing about the meme I looked up the movie and I'm sure I watched at least part of it when I was a kid, on air tv. I remembered the bug designs, which were the reason it caught my interest, I remember the action scenes with the bugs were fun, but I also remembered the plot and acting was a bit lacking.

I didn't remember the "I'm from Bs. As." line, I'm sure I would have found that absolutely hilarious even back then. Maybe I forgot or maybe I got too distracted during the several commercial breaks and missed some bits, can't say

[–] Cethin@lemmy.zip 7 points 2 days ago (1 children)

It's a purposefully campy movie. It's inspired by an actual fascist novel, but they're making fun of it in the movie. It's a really good watch, but you have to be fine with the camp.

Alternatively to the movie, or better in addition to, you should watch this.

Fun fact, bug planet scenes were all shot in Hells Half Acre, Wyoming

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[–] Aceticon@lemmy.dbzer0.com 19 points 2 days ago (1 children)

Only a couple more million years of natural evolution before we beetles capable of jet-powered flight...

[–] Rolive@discuss.tchncs.de 6 points 2 days ago

Assblasters!

[–] BeMoreCareful@lemmy.world 78 points 3 days ago (1 children)

Makes it's own peroxide. That's sort of hard core.

[–] archonet@lemy.lol 61 points 3 days ago (2 children)

And uses that peroxide to crap explosions at things. Extremely hardcore.

[–] Fetus@lemmy.world 29 points 3 days ago (3 children)

Big deal, I have explosive craps all the time.

[–] watson387@sopuli.xyz 28 points 3 days ago (2 children)

Have you ever spray-farted someone's face off?

[–] IAmNorRealTakeYourMeds@lemmy.world 20 points 3 days ago (1 children)
[–] watson387@sopuli.xyz 15 points 3 days ago

Nah man. If you can do that, we're good. You don't make an enemy of someone with that type of skill...

[–] dalekcaan@feddit.nl 7 points 3 days ago

I'm under court order not to answer that question.

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[–] MeatPilot@lemmy.world 4 points 2 days ago* (last edited 2 days ago)

For a good read, look for "For the Love of Insects" by Thomas Eisner who studied the bombardier beetle. The book doesn't focus on bombardier beetles. But he does go over how he made some discovers on the bombardier beetle.

Eisner was a wonderful scientist with a fascinating perspective.

[–] NONE_dc@lemmy.world 38 points 3 days ago (1 children)

How does it survives to its own attack?

[–] scytale@piefed.zip 47 points 3 days ago

Simple, it ducks before it shoots, like in the picture. ez

[–] mectag@lemmy.world 17 points 3 days ago (2 children)
[–] nailbar@sopuli.xyz 11 points 3 days ago (2 children)

Heh, it sprays its own head with it. Still some space for improvement.

[–] samus12345@sh.itjust.works 4 points 2 days ago

They can shoot it in different directions. This one's just not very smart.

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[–] lagoon8622@sh.itjust.works 5 points 2 days ago

They nip at his ankles, but he simply kicks them away

#inspo #goals #😤😤😤

[–] tenchiken@lemmy.dbzer0.com 24 points 3 days ago (1 children)

If y'all have not seen The Oatmeal's bit that includes a great piece on the bombadeer beetle, it's a treat:

https://youtu.be/ZZ_BtZ-5O60

GOD made that butthole!

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[–] plyth@feddit.org 7 points 2 days ago (3 children)

How can something like this evolve?

[–] GiveOver@feddit.uk 10 points 2 days ago (2 children)

Here's an attempted explanation

Quinones are produced by epidermal cells for tanning the cuticle. This exists commonly in arthropods. [Dettner, 1987]

Some of the quinones don't get used up, but sit on the epidermis, making the arthropod distasteful. (Quinones are used as defensive secretions in a variety of modern arthropods, from beetles to millipedes. [Eisner, 1970])

Small invaginations develop in the epidermis between sclerites (plates of cuticle). By wiggling, the insect can squeeze more quinones onto its surface when they're needed.

The invaginations deepen. Muscles are moved around slightly, allowing them to help expel the quinones from some of them. (Many ants have glands similar to this near the end of their abdomen. [Holldobler & Wilson, 1990, pp. 233-237])

A couple invaginations (now reservoirs) become so deep that the others are inconsequential by comparison. Those gradually revert to the original epidermis.

In various insects, different defensive chemicals besides quinones appear. (See Eisner, 1970, for a review.) This helps those insects defend against predators which have evolved resistance to quinones. One of the new defensive chemicals is hydroquinone.

Cells that secrete the hydroquinones develop in multiple layers over part of the reservoir, allowing more hydroquinones to be produced. Channels between cells allow hydroquinones from all layers to reach the reservior.

The channels become a duct, specialized for transporting the chemicals. The secretory cells withdraw from the reservoir surface, ultimately becoming a separate organ.

This stage -- secretory glands connected by ducts to reservoirs -- exists in many beetles. The particular configuration of glands and reservoirs that bombardier beetles have is common to the other beetles in their suborder. [Forsyth, 1970]

Muscles adapt which close off the reservior, thus preventing the chemicals from leaking out when they're not needed.

Hydrogen peroxide, which is a common by-product of cellular metabolism, becomes mixed with the hydroquinones. The two react slowly, so a mixture of quinones and hydroquinones get used for defense.

Cells secreting a small amount of catalases and peroxidases appear along the output passage of the reservoir, outside the valve which closes it off from the outside. These ensure that more quinones appear in the defensive secretions. Catalases exist in almost all cells, and peroxidases are also common in plants, animals, and bacteria, so those chemicals needn't be developed from scratch but merely concentrated in one location.

More catalases and peroxidases are produced, so the discharge is warmer and is expelled faster by the oxygen generated by the reaction. The beetle Metrius contractus provides an example of a bombardier beetle which produces a foamy discharge, not jets, from its reaction chambers. The bubbling of the foam produces a fine mist. [Eisner et al., 2000]

The walls of that part of the output passage become firmer, allowing them to better withstand the heat and pressure generated by the reaction.

Still more catalases and peroxidases are produced, and the walls toughen and shape into a reaction chamber. Gradually they become the mechanism of today's bombardier beetles.

The tip of the beetle's abdomen becomes somewhat elongated and more flexible, allowing the beetle to aim its discharge in various directions.
[–] plyth@feddit.org 3 points 1 day ago

I feel like being part of a setup that was created for this comment. That's more than I ever expected. Thank you very much.

[–] ohshit604@sh.itjust.works 5 points 2 days ago (5 children)

Why did you use a code block for a quote?

[–] GiveOver@feddit.uk 2 points 2 days ago (1 children)

I didn't do it on purpose, I just copied and pasted

[–] ohshit604@sh.itjust.works 2 points 1 day ago (1 children)
[–] GiveOver@feddit.uk 1 points 1 day ago (1 children)

I know it but I haven't seen a good way of doing a long quote. Do I need the > on every single line? I've no idea why this time it put it into a code block, maybe something to do with my app (sync). The comment actually looks fine in a code block on my app so I thought it was good enough. Didn't realise how shit it looked on desktop until you brought it up.

[–] ohshit604@sh.itjust.works 1 points 1 day ago* (last edited 1 day ago)

I know it but I haven't seen a good way of doing a long quote.

Just gotta do the start of each paragraph.


This is an example of a paragraph

This is paragraph 2

This is paragraph 3 without the leading >

This is paragraph 4


The comment actually looks fine in a code block on my app so I thought it was good enough. Didn't realise how shit it looked on desktop until you brought it up.

Each application will handle markdown differently, I would just stick with what is documented by Lemmy devs.

[–] trevdog@lemmy.world 3 points 2 days ago

idk why but I kind of like to read it with random keywords highlighted and every apostrophe toggling the effect

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[–] AwesomeLowlander@sh.itjust.works 5 points 2 days ago (1 children)

Proof that god hates us, we didn't get explosive fart cannons.

[–] SkaveRat@discuss.tchncs.de 9 points 2 days ago (1 children)

we didn’t get explosive fart cannons

speak for yourself

[–] OrteilGenou@lemmy.world 2 points 2 days ago

Right? Casual.

[–] Hirom@beehaw.org 7 points 2 days ago* (last edited 2 days ago)

The same way every living thing evolve. Through millon or billion of years of mutations and natural selection.

[–] Coolbeanschilly@lemmy.ca 17 points 3 days ago

This beetle is the natural equivalent of passing Taco Bell while listening to Johnny Cash's "Ring of Fire".

[–] Jamablaya@lemmy.world 2 points 2 days ago

BOMBADEER? fuckinng western Canadian spotted.

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