perfectionistpig

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Private Internet Access, a VPN provider, takes out a full page ad in The New York Time calling out 50 senators.

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HAPPY BIRTHDAY EREN![30/3]

Eren’s eyes post appreciation  (Part I)

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Stupid dads being SO STUPID

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Akutagawa Ryuunosuke + personality traits (insp.)

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Jojo’s Bizarre Adventure | Episode 1: A Man Possessed by an Evil Spirit

One day, an unmanned cruiser was sighter. The boat was in perfect working order, and there was no indication of an attack. However, the only signs of life on board were three half-full cups of coffee… And… An acetylene blowtorch. It had been used to open the steel box on deck. The box was empty, but it is believed to have sheltered something inside its two compartments. Some believed it contained treasure, but after a few months, it was entirely forgotten.

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another awkward work in progress hehe :’D 

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Every time

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Yes, sure its fun to see a lady spin around like that, but I had one of my friends ask me - “Where do you even use this mate?”

Here’s one application that I know very well off.

Spin Stabilization

If you have ever seen a rocket launch, you might know that sometimes the rockets are given a spin while launching. This is known as spin stabilization.

Basically, the rotational inertia of the rotating body will stabilize the rocket against any disturbances and help maintain its intended heading.

The same principle is used in rifling of firearms as well. **

YoYo DeSpin

Okay, now there is the question how to “De-spin” the rocket:

Well, you do what the lady does: stretch out your arms and you will slow down !

The rocket has weights connected to a cable that stretch out and almost immediately the rocket slows down. This maneuver is known as the YoYo DeSpin. ( Damn good name ! )

All thanks to the conservation of angular momentum !

Have a good one !

* Another method to stabilization : 3-axis stabilization

** Bullets spin stabilization - post

** Source rocket launch video

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Something I find incredibly cool is that they’ve found neandertal bone tools made from polished rib bones, and they couldn’t figure out what they were for for the life of them. 

Until, of course, they showed it to a traditional leatherworker and she took one look at it and said “Oh yeah sure that’s a leather burnisher, you use it to close the pores of leather and work oil into the hide to make it waterproof. Mine looks just the same.” 

“Wait you’re still using the exact same fucking thing 50,000 years later???”

“Well, yeah. We’ve tried other things. Metal scratches up and damages the hide. Wood splinters and wears out. Bone lasts forever and gives the best polish. There are new, cheaper plastic ones, but they crack and break after a couple years. A bone polisher is nearly indestructible, and only gets better with age. The more you use a bone polisher the better it works.”

It’s just. 

50,000 years. 50,000. And over that huge arc of time, we’ve been quietly using the exact same thing, unchanged, because we simply haven’t found anything better to do the job. 

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bsd meme [6/6] characters ↳ Ozaki Kouyou

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About all you can do in life is be who you are. Some people will love you for you. Most will love you for what you can do for them, and some won’t like you at all.

Rita Mae Brown (via naturaekos)

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Finally learned the kick that broke my foot

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柴犬ハナさんのツイート: “投げるよ!! (っ’-’)╮ =͟͟͞͞💕ﾌﾞｫﾝ って言ったのにぃ～(๑•́ ₃ •̀๑).｡oஇ https://t.co/yWTmGnEqAy”