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Michael Raiford wrote:
> He also filled a huge rubber balloon with a 2:1 ratio of pure hydrogen
> and oxygen. Then took a flame to it. People on the other side of the
> school campus heard the resulting bang.
Oh, and there was also the day we destroyed who knows how many pennies
... I took the opportunity to "pour" the resulting brown gas (Nitrogen
dioxide, I think?) from one container to another.
Judging from the Wikipedia article, a fume hood would have been a wise
thing to use while doing this. :/
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Michael Raiford wrote:
> Oh, and there was also the day we destroyed who knows how many pennies
> ... I took the opportunity to "pour" the resulting brown gas (Nitrogen
> dioxide, I think?) from one container to another.
>
> Judging from the Wikipedia article, a fume hood would have been a wise
> thing to use while doing this. :/
Did you HAVE a fume hood?
(At my school, our science lab was equiped with Bunsen burners, clamp
stands and some glassare. And that's it.)
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Michael Raiford wrote:
>> I was *far* more concerned by the bottle at the
>> back labelled "WARNING: Explosive when dry" containing an amorphus dry
>> powder...
>
> Hmmm.... No, probably not good.
According to my dad, the label was an exaggeration.
(I got a chain email once: "You know you've been working in a lab too
long when...
...you can tell the difference between the cheap lab coats and the
expensive ones...
...everything is far less dangerous than you thought...")
> I was always intrigued by the metallic canister with the yellow and
> black international symbol for radiation on it, which resided in the
> physics classroom. Apparently in the later physics classes, they get to
> play with a Geiger counter.
o_O
You get radioactive stuff just to prove the counter works?!
Actually, anyone who's ever played with one of these will confirm a very
disturbing fact: Almost *everything* is slightly radioactive! Seriously.
Everything I put near the thing registered very slightly. Including my
lunch...
> Our chemistry teacher used to do some after school sessions. I showed up
> to more than a few. One of which was begun by him handing everyone latex
> gloves, then handing is little chunks of a grayish, soft metal. Oh,
> yeah... and there was this big bucket of water ...
>
> Sodium is fun. XD
I recall Sodium as being yellow... (At least, unless you get it. The
resulting surface is silver, but corrodes faster than a Landrover.)
> He also filled a huge rubber balloon with a 2:1 ratio of pure hydrogen
> and oxygen. Then took a flame to it. People on the other side of the
> school campus heard the resulting bang.
>
> Strangely, he was reassigned to biology the next year ...
Hmm... 0:-)
Well, my dad can't get fired from being my dad.
- When we ran out of matches, my dad used a mixture of glycerin and
potassium permangenate to light the bonfire. (Actually, a small ant
crawlled into the thick sticky glycerin blob moments before ignition...)
- My dad made gunpowder once. It made quite a bang...
- Apparently if you mix amonia and some other compound together, the
resulting mixture explodes when it dries out. We smeared it over a
cardboard box in the garden. For some reason, it only ever exploded at
night... A succession of small pops and bangs.
- There's a trick you can do with (IIRC) hydrogen chloride. It absorbs
water quite well. So if you will a bottle with hydrogen chloride and
then put a tube into a tub of water, you get a little fountain inside
the bottle as the pressure drops. For added amusement, add some
indicator to the water. (I recall the blue liquid emerging in the bottle
as a bright yellow fountain.)
- Flash powder. Finely powdered alunimium with potassium permangenate. I
have no idea what colour the flash it actually produces is - as this
point, you're usually just glad to be able to *see* again! (I actually
put some of this stuff into the school bonfire - but that's another
story. It seems I'm currently fresh out of KMnO4...)
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471b1ceb$1@news.povray.org...
> Actually, anyone who's ever played with one of these will confirm a very
> disturbing fact: Almost *everything* is slightly radioactive! Seriously.
> Everything I put near the thing registered very slightly. Including my
> lunch...
>
Even more since 1986 :-s
One of the biggest lies from French authorities : "the Tchernobyl cloud did
not pass the French boundaries"
Marc
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Orchid XP v7 wrote:
> Did you HAVE a fume hood?
> (At my school, our science lab was equiped with Bunsen burners, clamp
> stands and some glassare. And that's it.)
Kids these days! At MY school, our science lab was equipped with
whatever brush fire happened to be nearby, a few pointed sticks, and
some random stones! Crazy teacher kept going on about turning lead into
gold.
--
Tim Cook
http://home.bellsouth.net/p/PWP-empyrean
-----BEGIN GEEK CODE BLOCK-----
Version: 3.12
GFA dpu- s: a?-- C++(++++) U P? L E--- W++(+++)>$
N++ o? K- w(+) O? M-(--) V? PS+(+++) PE(--) Y(--)
PGP-(--) t* 5++>+++++ X+ R* tv+ b++(+++) DI
D++(---) G(++) e*>++ h+ !r--- !y--
------END GEEK CODE BLOCK------
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Orchid XP v7 wrote:
> Did you HAVE a fume hood?
Of course not!
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From: Michael Raiford
Subject: Re: Life Sucked at My School This Week
Date: 21 Oct 2007 10:50:42
Message: <471b6742@news.povray.org>
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Orchid XP v7 wrote:
>
> I recall Sodium as being yellow... (At least, unless you get it. The
> resulting surface is silver, but corrodes faster than a Landrover.)
>
Seems like it was a grayish metal with a cream-yellow colored crust over it.
> - When we ran out of matches, my dad used a mixture of glycerin and
> potassium permangenate to light the bonfire. (Actually, a small ant
> crawlled into the thick sticky glycerin blob moments before ignition...)
Almost as good as when I convinced my parents to order some potassium
permanganate. I knew what would happen, and did the same on our back
porch. My mom wasn't too pleased. My dad was a bit concerned. I didn't
get grounded. They didn't quite know what to do with the rest of a very
powerful oxidizer.
> - My dad made gunpowder once. It made quite a bang...
>
> - Apparently if you mix amonia and some other compound together, the
> resulting mixture explodes when it dries out. We smeared it over a
> cardboard box in the garden. For some reason, it only ever exploded at
> night... A succession of small pops and bangs.
sounds like nitrogen triiodide. Contact explosive... supposedly fun stuff..
> - There's a trick you can do with (IIRC) hydrogen chloride. It absorbs
> water quite well. So if you will a bottle with hydrogen chloride and
> then put a tube into a tub of water, you get a little fountain inside
> the bottle as the pressure drops. For added amusement, add some
> indicator to the water. (I recall the blue liquid emerging in the bottle
> as a bright yellow fountain.)
I think I need a diagram to understand this one. the description of the
set up is a bit unclear.. Hmm.
> - Flash powder. Finely powdered alunimium with potassium permangenate. I
> have no idea what colour the flash it actually produces is - as this
> point, you're usually just glad to be able to *see* again! (I actually
> put some of this stuff into the school bonfire - but that's another
> story. It seems I'm currently fresh out of KMnO4...)
Hmmmm..
Actually, I don't know if its the same for the UK, but in the US,
potassium permaganate is apparently (according to Wikipedia) considered
a drug precursor and is apparently difficult to get without going
through all sorts of DEA procedures and forms.
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"Gail Shaw" <initialsurname@sentech sa dot com> wrote in message
news:471a7343@news.povray.org...
>
> "Orchid XP v7" <voi### [at] dev null> wrote in message
> news:471a5fde@news.povray.org...
>
>>
>> Yeah - and then rebuild all the table structures, indexes, data
>> permissions, etc. :-S Still, it depends on how "vital" the data is. I
>> take it you didn't just loose your entire customer list or anything? ;-)
>
> Not necessary. Do a select * from all the system tables too, or generate
> the
> scripts straight from the system tables Is possible at least in MS SQL. Is
> something that I do fairly often when creting a replica of the prod
> environment
>
> Still that is the last resort. Should always be able to revert back to a
> backup.
Yep it is possible and I may have a go at it. Oracle Enterprise Manager is
much more work to set up than the Recovery Manager. Although I was earlier
testing out the export on RMAN, OEM is more critical to preserve because of
the amount of work redoing it.
RMAN has features that make life easier recovering from this situation:
When a database physical backup happens, as well as storing its backup job
info in the RMAN catalog, RMAN also stores it in the client DB's own
controlfile, which is part of the physical structure of the DB. So the
database contains its own recovery information and backups do still happen
even with the catalog lost, and it does all get sent to tape eventually.
Secondly, Oracle version 10g (three DBs are 10g RMAN clients here) has a
cool, easy feature: In one command, all the physical files in the backup
storage area are scanned, type-identified, and any orphan backups that are
unknown to the catalog can be added into it. It is easy to build a new
empty catalog and then populate it with data from prior backups.
I expect much more trouble with preserving OEM objects. I haven't looked in
detail, but I expect it has a complex schema. It would be best if I use an
AppDev tool to pull all the definitions for all objects, because it would
take much study and work to make a roll-your-own SQL script that reads the
data dictionary and dynamically writes user object build scripts based on
what it finds.
Selecting from tables, their column definitions and table data are only a
small part of getting the data and structure out: I have to get the entire
application out. I would also have to make SQL to recreate:
Table type (heap, index-organised, cluster, partition) Definitions of all
indexes and constraints on each table, foreign-key constraints to other
tables, tablespace and storage info, remembering again to do the same for
each of its indexes.
Triggers on the tables -- PL/SQL code that fires before/after an
insert/update/delete.
Sequences, including the number they are now at. (So new sequences are
created from that starting point instead of starting at one)
Views -- named SQL that can be selected and joined as one uses a table in
most places.
The program code stored in PL/SQL functions, procedures and packages.
Jobs. Ugh, I know the least about these. I'm sure OEM will have job
schedules registered in the database engine.
I already have a script that dynamically builds a bunch of creation SQL
scripts for such things as users (also preserving passwords by copying the
encrypted value), roles, grants, quotas.
Actually, the more I think about it, the more I think that the normal
procedure of building Enterprise Manager and discovering all the target
Oracle DBs, listeners, etc, setting up the administrators, alarm triggers,
notification pagers and emails -- bad as it is, it may be easier and more
reliable in the end. Certainly the final result would have vendor support,
whereas one I made with manually-pulled data wouldn't, and you could never
be sure that what you made works 100% kosher and won't blow up on you later
or let you down in an emergency.
We will have an export of the OEM schema. It is just oldish because it is
before the exports began to fail. I would try loading that before doing a
full rebuild or manual script-magic-blue-smoke anyway.
--
Cheers,
Brian
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From: Brian Elliott
Subject: Re: Life Sucked at My School This Week
Date: 21 Oct 2007 11:21:25
Message: <471b6e75@news.povray.org>
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"Brian Elliott" <NotForSpam@AskIfUWant> wrote in message
news:471b6c5d$1@news.povray.org...
>
> Yep it is possible and I may have a go at it. Oracle Enterprise Manager
> is much more work to set up than the Recovery Manager. Although I was
> earlier testing out the export on RMAN, OEM is more critical to preserve
> because of the amount of work redoing it.
>
> RMAN has features that make life easier recovering from this situation:
> When a database physical backup happens, as well as storing its backup job
> info in the RMAN catalog, RMAN also stores it in the client DB's own
> controlfile, which is part of the physical structure of the DB. So the
> database contains its own recovery information and backups do still happen
> even with the catalog lost, and it does all get sent to tape eventually.
> Secondly, Oracle version 10g (three DBs are 10g RMAN clients here) has a
> cool, easy feature: In one command, all the physical files in the backup
> storage area are scanned, type-identified, and any orphan backups that are
> unknown to the catalog can be added into it. It is easy to build a new
> empty catalog and then populate it with data from prior backups.
>
> I expect much more trouble with preserving OEM objects. I haven't looked
> in detail, but I expect it has a complex schema. It would be best if I
> use an AppDev tool to pull all the definitions for all objects, because it
> would take much study and work to make a roll-your-own SQL script that
> reads the data dictionary and dynamically writes user object build scripts
> based on what it finds.
>
> Selecting from tables, their column definitions and table data are only a
> small part of getting the data and structure out: I have to get the
> entire application out. I would also have to make SQL to recreate:
>
> Table type (heap, index-organised, cluster, partition) Definitions of all
> indexes and constraints on each table, foreign-key constraints to other
> tables, tablespace and storage info, remembering again to do the same for
> each of its indexes.
>
> Triggers on the tables -- PL/SQL code that fires before/after an
> insert/update/delete.
> Sequences, including the number they are now at. (So new sequences are
> created from that starting point instead of starting at one)
>
> Views -- named SQL that can be selected and joined as one uses a table in
> most places.
> The program code stored in PL/SQL functions, procedures and packages.
>
> Jobs. Ugh, I know the least about these. I'm sure OEM will have job
> schedules registered in the database engine.
>
> I already have a script that dynamically builds a bunch of creation SQL
> scripts for such things as users (also preserving passwords by copying the
> encrypted value), roles, grants, quotas.
>
> Actually, the more I think about it, the more I think that the normal
> procedure of building Enterprise Manager and discovering all the target
> Oracle DBs, listeners, etc, setting up the administrators, alarm triggers,
> notification pagers and emails -- bad as it is, it may be easier and more
> reliable in the end. Certainly the final result would have vendor
> support, whereas one I made with manually-pulled data wouldn't, and you
> could never be sure that what you made works 100% kosher and won't blow up
> on you later or let you down in an emergency.
>
> We will have an export of the OEM schema. It is just oldish because it is
> before the exports began to fail. I would try loading that before doing a
> full rebuild or manual script-magic-blue-smoke anyway.
Ah yes, I forgot I would also have to include definitions for synonyms,
materialized views and types. There are likely more that I still haven't
remembered.
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Michael Raiford wrote:
> school campus heard the resulting bang.
I had friends who worked at a science museum (the Franklin Institute)
giving lectures and such. One day Tony filled a 3-foot weather balloon
with hydrogen and oxygen, and put it on a long thread so it floated near
the top of the lecture hall. (Picture a stadium-seating huge room like
you see college lectures being given in in movies.) Then he points the
parabolic heat lamp at it and turns off all the switches.
Kurt goes in, turns on all the lights, starts his lecture on liquid air.
I walk in, and Tony is in the back of the room, going "SHhh! Shhh!"
About five minutes into the lecture, there's a kaBOOM that literally
cracks some of the windows. Kurt jumps about three feet, looks around,
waves to Tony, and goes back to lecturing.
(This is the same Tony that couldn't figure out where the cardboard
canister he'd stuffed home-made high explosives into went after he
touched it off and blew a 3-foot deep crater in the dirt.)
--
Darren New / San Diego, CA, USA (PST)
Remember the good old days, when we
used to complain about cryptography
being export-restricted?
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