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Maybe it would give all of the trolls someplace to hang out with their sock puppets. Doug

There's no reason to keep that information secret. And it's really doubtful if they could even if they wanted to. Doug

Thje relative speed between the car and the truck is 13 km/h. At 13 km/h how long will it take to cover 130 m? (you better get .01 hours or 36 seconds). Now... You go figure out the other one. All it takes is a little bit of 'horse sense'. Doug

At this point it is a genuine UFO. But, as soon as you find out what it is, It will become an IFO. Doug

ROTFLMSFAO!!!!!!!!!!!!!!!!! The answer is d. But everybody who lives here, in Tucson, just shakes their heads and laughs about that whole 'Biosphere' joke. Doug

Try 'Principles of Physical Cosmology' by P.J.E. Peebles. Doug

Probably a whole bunch of such things. Doug

Try 'Principles of Physical Cosmology' by P.J.E. Peebles. Doug

I wouldn't be able to see anything in Roseville since I live in Tucson. Doug

They could also probably get you a pretty good deal on the Golden Gate Bridge or the Eiffel Tower. Doug

I'm no longer a 'Top Contributor' because I don't have enough time to hang out here. But no, I don't work for NASA. I know some people who do, and I've done a couple of consulting things that ended up involved with the Space Program, But that's about the extent of my relationship to NASA. Doug

That really is a very excellent question. My guess is that a races interest in (and involvement with) technology is probably proportional (in some sense) to how difficult it is for them to survive. i.e. How much work do they have to do to provide whatever their 'basic necessities' are? Also...