Recent content by Janitor

Everybody Plays the Fool by The Main Ingredient In the Summertime by Mungo Jerry Master Jack by Four Jacks and a Jill

Glad to hear my time spent reading it was not wasted. :smile:

CNN is covering it. There is a bright glow where the impact occurred. Hope to hear soon about the composition of the comet.

I witnessed something this week that reminded me of a similar incident that happened a quarter-century ago, and that in turn reminded me of this discussion thread. The extended family was at my grandparents' house. As it happens, Grandpa was walking around with an old coin in his hand...

I note that these were just four ordinary LEDs with their hemispherical plastic "lenses" pointing straight up, such that at any given time the locomotive might be catching only one or two colors. If you were to stop the rotation of the platform, the front of the locomotive might be green while...

Block that Nixon!

Not if my understanding of holography is correct. The image remained visible to the eye as a white-colored 3D pattern even when viewing the glass under ordinary room lighting.

SGT's link says that gallium nitride is the material needed to make the blue LED. Thanks for that link. Averagesupernova, are you speculating, or have you heard that this is how it is done? If is is some sort of heating effect, what is happening to the heated glass that makes it form opaque...

Put some Roger Miller on the turntable, and you'll be fine. [Showing my age.]

Okay, so this is really two questions, one having to do with electrical engineering, and the other having to do with materials processing (a name I just made up). I was at a museum, and I saw on display a rotating platform that held a slab of clear glass. Inside the glass there was a milky 3D...

I thought the Eagles were singing "It's a girl my Lord, in a black, bent Ford." :tongue2:

Don't know. I used to think that a certain popular tune on the radio in the 1970s was saying: "That ombudsman don't know which way to turn."

I mail-ordered some music CDs, including one by the Anita Kerr Singers. Some kind soul at the warehouse tucked in an A.A.R.P. membership blank for me.

Pour the money fishwalker.

Suppose you had enough of these nanotubes lying together on a flat surface, packed like sardines, that your naked eye could see a little patch of them. What color would they be? I have been picturing them as gray, but I have absolutely no justification for that.