Grace Hopper - Nanoseconds

Grace Hopper explains Nanoseconds.

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Science & Technology

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• Grace
• Hopper
• Nanoseconds

[federicobaserga]

... I don't think electricity travels at the speed of light, in a piece of wire neither in outer space. By the way, it was a pretty clear explanation of the dualism of spacetime.

[SeHouMusic]

@federicobaserga The velocity and the electrical resistance outside of conduction is often assumed by the propagation speed of an electromagnetic wave.In simplified systems,the speed of electricity is given as the electromagnetic wave which conveys information(data), not the movement of electrons.Propagation speed is affected by insulation,such that in an unshielded copper conductor range 95 to 97% that of the speed of light,while in a typical coaxial cable it is about 66% of the speed of light.

[teamhex]

Proof old people can indeed be interesting.

[VioletGiraffe]

I thought I understand ns, but I didn't. NOW I really do!

[federicobaserga]

Ok, a signal containing information can hypothetically approach the upper limit given by c, but I think the word "electricity" was somehow misleading. In fact, electricity is a vague term, and maybe the majority of people think of it like the actual motion of electrons instead of a synonym of "signal".

[revolvingcur]

This is marvelous. I had assumed there weren't any extant videos of Grace Murray Hopper, because I didn't know she had ever taught. I'm really glad this has been preserved.

[FreeFireFull]

@federicobaserga I think in copper it travels at 50% of the speed of light or something like that.

[bytebossbill]

I was present when Grace gave this talk many years ago. Did this bring back a lot of memories. What a great lady.

[linuxluver]

@teamhex More than interesting. Grace Hopper wrote the first-ever program compiler and laid down the foundations for what became COBOL. She was a modern pioneer at the first glimmer of the computing era.

[DrewDAMNIT]

Great footage. Thanks for posting.

[shikatsu]

@mgrennan She had the bloody thing mounted, I lived in her building in around 86-87 I was three and was a real geek even then shared with her the games I played and the things I did with an old IBM machine.