Today I Learned

[etotheipi]

Can a rod that passes through only one hole of a double torus be made to pass through both, without tearing or merging? A fun topology puzzle :

 

[Ibix]

Can a rod that passes through only one hole of a double torus be made to pass through both, without tearing or merging? A fun topology puzzle :

I take it you are familiar with the correct way to slice a bagel?

 

[etotheipi]

I take it you are familiar with the correct way to slice a bagel?

I've been enlightened; I've been doing it wrong my whole life! Though I'm not sure I quite buy this part :

"You can toast them in a toaster oven while linked together"

But it sure beats this thing of nightmares...:

I can feel it staring into my soul

 

[Ibix]

Though I'm not sure I quite buy this part

A toaster oven is basically a standalone grill (not what we Brits would call a toaster, if that's what you are thinking of), and I can confirm that you can toast the linked halves in a grill. It's a faff, as is spreading anything on the bagel to eat, but I did it a couple of times years ago for nerd-cred. Use low heat and keep the bagels as far from the flame/element as possible - they don't lie flat and the raised bits tend to burn.

The spherical dog is somewhat horrific.

 

[fresh_42]

I take it you are familiar with the correct way to slice a bagel?

... said Mrs. Jones.

 

[etotheipi]

Ah okay, that makes more sense. I can't cook to save my life, though I can at least say that I've gotten pretty good at microwaving. Who knows, maybe I'll branch out and learn how to grill bagels before uni . Although I'd probably just end up absolutely scorching them...

 

[Keith_McClary]

The spherical dog is somewhat horrific.

Physicists are more accustomed to:

 

[BillTre]

The spherical dog is somewhat horrific.

Reminds me of a puffer fish:

 

[BillTre]

Evolution of the user interface:

 

[Keith_McClary]

Evolution of the user interface:
View attachment 264512

 

[Ibix]

Reminded by the trench run computer above, from Diary of a Crazed Mimbanite:

Red 5, your targetting computer's off!

It's ok - the voices in my head told me to do that.

 

[fresh_42]

 

[etotheipi]

Red 5, your targetting computer's off!

It's ok - the voices in my head told me to do that.

It's okay! The entire rebellion on Yavin IV is about to be blown to pieces by a huge planet-killing superlaser, but some robe-wearing hermit who I've known for like 3 or 4 days at best tells me things will be just fine if I completely fluke this one-in-a-million shot into a foot wide thermal exhaust port!

 

[jbriggs444]

TIL that womp rats are 2 meters in size while exhaust ports are only 1 foot.

 

[etotheipi]

TIL that womp rats are 2 meters in size while exhaust ports are only 1 foot.

My bad, you're quite right! I just eyeballed (guessed...) the figure.

Galen Erso sure wasn't taking any chances!

 

[Hsopitalist]

TIL

There is a craze in Saudi Arabia called sidewalk skiing which involves driving on two wheels of a car either drivers or passenger side.

 

[DennisN]

I recognize the blue ones and grey ones from my childhood.
Ah, Lego Space. But I liked Lego Technics even more; I remember building an AT-AT that could walk (it had a motor). And I also remember me and my friend shooting at the AT-AT with an air rifle.

 

[DennisN]

Today I learned that "optimism is just a lack of experience".
(I read it somewhere on the net and had a laugh)

 

[fresh_42]

Today I learned that "optimism is just a lack of experience".
(I read it somewhere on the net and had a laugh)

I have heard it from a German stand-up comedian, who called it "lack of information".

 

[Adesh]

View attachment 264529

Which one do you own?

 

[Adesh]

Today I learned that Freddie Mercury spent much of his childhood and teenage in India.

 

[Keith_McClary]

Which one do you own?

I had a car that came with a starting crank.

Edit: It was of this era


but not a spiffy sports car.

 

[chemisttree]

Evolution of the user interface:
View attachment 264512

And this...

 

[Tom.G]

I had a car that came with a starting crank.

Edit: It was of this era


but not a spiffy sports car.

Obviously not someone that has often done that! The OPs grip on the crank can lead to a broken thumb (at least).

It is safer to place the thumb next to the Index finger, on the same side of the crank handle. An engine will sometimes kick back, fire before reaching TDC (Top Dead Center) when cranking. With the demonstrated grip, the full force of that is taken by the thumb, trying to remove same from hand. Ouch!

 

[fresh_42]

Obviously not someone that has often done that! The OPs grip on the crank can lead to a broken thumb (at least).

It is safer to place the thumb next to the Index finger, on the same side of the crank handle. An engine will sometimes kick back, fire before reaching TDC (Top Dead Center) when cranking. With the demonstrated grip, the full force of that is taken by the thumb, trying to remove same from hand. Ouch!

Not to mention his tibia.

 

[Adesh]

Today I learned that inequalities are most disloyal things, you see
$0 \leq \sin^4x \leq 1$
$0\leq \cos^4 x \leq 1$
But if you add them the right bound become strict :
$0 \leq \sin^4 x +\cos^4 x \lt 2$

 

[etotheipi]

But if you add them the right bound become strict :
$0 \leq \sin^4 x +\cos^4 x \2$

What do you mean? If $x \leq 2$ and $y \leq 3$ then $x + y \leq 5$, no? Or have I missed something

 

[Adesh]

What do you mean? If $x \leq 2$ and $y \leq 3$ then $x + y \leq 5$, no? Or have I missed something

Not true (always, may be true sometimes) for trig functions.

 

[etotheipi]

Not true (always, may be true sometimes) for trig functions.

Hmm but if $A < B$ then $A \leq B$ always. It doesn't work the other way around!

 

[Adesh]

Hmm but if $A < B$ then $A \leq B$ always. It doesn't work the other way around!

$\sin^4 x +\cos^4 x$ can never be equal to 2. So, we cannot just blindly add two inequalities.