OT: How Amazing

[narf poit chez BOOM]

Originally posted by dogscoff:

quote:

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Last I heard, stem cells were gotten from the unborn.
and I suggest that discussion break off here.

Then you haen't been keeping up to date. Stem cells can now be found in all kinds of places that do not involved aborted foetuses or "the unborn" at all.

Imagine someone in need of a new kidney giving a DNA swab from their mouth, and having stem cells grown from that, and from those stem cells a new organ being grown specifically for them. Since the genetic material would be their own, there would be no (or very little) risk of rejection, which would make the process infinitely more successful. etc...

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Well, that's a load off my mind.

[Randallw]

First off, I like Atrocities have a disability. I am totally deaf in one ear because I have a disease that ruins my hearing. I take comfort at least that if my other ear goes I can still play SE4 (with the sound turned off) and uses the internet, plus I can still read (in fact I can read while blocking my good ear with one finger). Anyway back to the topic. Every month I go to the Library and read Popular Mechanic and Science. Its amazing what technologies are being built. As well as the monkey strapped into a machine so only the bionic arm run from cables in its head moves, there are replicators being built. Not molecular ones, but simple ones printing 3 dimensional shapes. In the future you could have your replicator in your workshop and when you need new cutlery or crockery or maybe furniture you just "print" one out.

[dogscoff]

Yeah, they use those 3D printers to make models of new cars and things. It's really sci-fi looking.

Talking about "printing" 3D objects- I can't remember if it was here or somewhere else but I read about a new type of printer- that "prints" buildings! it's a robot that scoots around and leaves a trail of concrete behind it. It "draws" out the outline of the walls, waits for the concrete to set, then lays the next layer of concrete on top, and the next...

It can only do single-story buildings with domed roofs, but it sounds like a way-cool toy.

[Randallw]

Another technology I keep my eyes out for are Solar Chimneys. Basically you have hot air from green houses rising up the chimney turning turbines. All you need are plenty of space to build Kilometer tall buildings, and 16 hours of sunlight a day, which here in Australia we have nothing but. They've built small prototypes and Last I heard our parliament had allowed it, but I'm not sure what progress has been made since.

Edit: oh, and a year or two ago I read of Mechs being developed to use in construction.

[ March 25, 2004, 07:23: Message edited by: Randallw ]

[narf poit chez BOOM]

*sigh* a few solar power satalites are all a country needs...

[ March 25, 2004, 07:59: Message edited by: narf poit chez BOOM ]

[Jack Simth]

Originally posted by narf poit chez BOOM:
*sigh* a few solar power satalites are all a country needs...

At present, in theory, satelites could be constructed that would capture enough energy to power things sure - but there are some catches:
1) Size: There isn't too terribly much difference in the wattage the sun delivers to a square foot on Earth as it does to a square foot in space, ignoring for the moment the day/night cycle and weather - any such satellite would need to be absolutely enourmous, which causes some difficulties in getting it up there.
2) Transmission and Transmission Safety: Once you have the satellite up there, collecting energy, you have to get all that energy back down where you want to use it. Sure, you could maser it down or something, but what then happens when a solar storm causes the satellite to wander slightly off course? For a communications or weather satellite, a small change in facing doesn't much matter, as there isn't enough energy in the transmissions to mean anything; it can be corrected with manuvering jets or gyroscopes at a later time, with the only drawback being the use of fuel (for jets only) and the downtime. For a power sat, with the distances involved, an extremely minor change in facing could very well cause all that energy to destroy a city, as it turns into heat and causes very bad fires at an unprepared site rather than being properly converted at a prepared site (a large change in facing wouldn't be as bad, as the distance involved means it is more likely to miss Earth entierly). This is complicated by several factors: the Earth is moving, the satelite is orbiting (probably spinning, too), the moon tugs on things, et cetera.
3) Expense (part of 1, in many ways): For the moment, it is ludicrously expensive to get something into orbit. The expense a solar sat would entail would likely makes other, earth-bound energy production mechanisms such as nuclear power plants positively cheap in comparison, although the majority of that is likely the initial expense rather than the ongoing matenince costs.
4) Transmision loss: Every time you ship energy around - especially when changing the form the energy is in - an amount is lost to a waste form of energy that you can't use (heat, mostly). The most expensive solar panels are around what 20% (?) efficency - which means that only one-fifth of the light that hits them is turned into useful electricity, the rest is lost. Changing that electricity into microwaves for transmission intruduces another ineffeciency, as does capturing the microwaves on the ground and converting them back into electricity. By the time the energy has finally reached the ground, we'll probably be lucky to manage 1% overall capture. That can be made up for in size, of course, but then you get back to 1 and 3.
5) Unknown effects: There really isn't any way of knowing beforehand what the effect of pouring that much energy through the air in a concentrated beam will do to such things as the weather, both long term and short, even assuming you can get past 2.

It is very likely all of those can, given time and research, be overcome. For now, however, ground-based energy production is more feasable ... but that will likely not stay true forever.

[Randallw]

Originally posted by narf poit chez BOOM:
*sigh* a few solar power satalites are all a country needs...

can you please explain the significance of the sigh. Without jumping to conclusions I would like to know what it means.