Talk:3115: Unsolved Physics Problems - Revision history

BunsenH at 14:33, 5 October 2025

2025-10-05T14:33:56Z

172.223.58.201 at 12:54, 5 October 2025

2025-10-05T12:54:01Z

Hkmaly at 23:07, 22 July 2025

2025-07-22T23:07:00Z

Tomb: Added explanation of why rocks don't grow hair.

2025-07-17T20:20:37Z

Added explanation of why rocks don't grow hair.

BunsenH: cholesterol crystal shapes

2025-07-17T17:13:11Z

cholesterol crystal shapes

DL Draco Rex at 19:23, 16 July 2025

2025-07-16T19:23:26Z

RegularSizedGuy at 13:00, 16 July 2025

2025-07-16T13:00:47Z

82.13.184.33 at 08:02, 16 July 2025

2025-07-16T08:02:44Z

82.13.184.33 at 08:02, 16 July 2025

2025-07-16T08:02:27Z

KingPenguin at 02:19, 16 July 2025

2025-07-16T02:19:49Z

← Older revision		Revision as of 14:33, 5 October 2025
Line 29:		Line 29:

	<<... ''In reality, metallic elements do not have motivations and intentions'' ...>> I just ''knew'' while reading this statement that a "citation needed" would be at the end. It really bothers me that there isn't one indicating, to me at least, that there normally is on this site after such a statement. But I don't want to step on any toes and change it. AlexaDTink [[Special:Contributions/172.223.58.201\|172.223.58.201]] 12:54, 5 October 2025 (UTC)		<<... ''In reality, metallic elements do not have motivations and intentions'' ...>> I just ''knew'' while reading this statement that a "citation needed" would be at the end. It really bothers me that there isn't one indicating, to me at least, that there normally is on this site after such a statement. But I don't want to step on any toes and change it. AlexaDTink [[Special:Contributions/172.223.58.201\|172.223.58.201]] 12:54, 5 October 2025 (UTC)
		+	:But a "citation" ''was'' provided. I don't think it would be appropriate to put in a CN tag there. [[User:BunsenH\|BunsenH]] ([[User talk:BunsenH\|talk]]) 14:33, 5 October 2025 (UTC)

← Older revision		Revision as of 12:54, 5 October 2025
Line 27:		Line 27:

	I would add that some fields like avionic and medicine are still allowed to use lead in solder because while lead is toxic, NOT using it could easily cost more lives in such cases. -- [[User:Hkmaly\|Hkmaly]] ([[User talk:Hkmaly\|talk]]) 23:07, 22 July 2025 (UTC)		I would add that some fields like avionic and medicine are still allowed to use lead in solder because while lead is toxic, NOT using it could easily cost more lives in such cases. -- [[User:Hkmaly\|Hkmaly]] ([[User talk:Hkmaly\|talk]]) 23:07, 22 July 2025 (UTC)
		+
		+	<<... ''In reality, metallic elements do not have motivations and intentions'' ...>> I just ''knew'' while reading this statement that a "citation needed" would be at the end. It really bothers me that there isn't one indicating, to me at least, that there normally is on this site after such a statement. But I don't want to step on any toes and change it. AlexaDTink [[Special:Contributions/172.223.58.201\|172.223.58.201]] 12:54, 5 October 2025 (UTC)

← Older revision		Revision as of 23:07, 22 July 2025
Line 24:		Line 24:

	First-year chem lab on purification by recrystallization. We started with human gallstones — I don't recall if we had the actual "stones" and crushed them or even just dissolved them whole, or started with the powdered material. This material was dissolved in the smallest amount of boiling solvent that would do the job, giving a dark brown solution. The solution was cooled in an ice bath, and the cholesterol precipitated out (leaving some still in solution, which reduced the yield). The crystals were filtered out, very pale beige. The procedure was repeated, and the resulting crystals were white/colourless. One interesting observation was that the crystals that came out of the first stage were wide flat thin plates, but the second stage gave long needle-like crystals. Same materials, same solvent, same temperatures, same procedures and handling... but the concentrations of the impurities in solution completely changed how the crystals grew. [[User:BunsenH\|BunsenH]] ([[User talk:BunsenH\|talk]]) 17:13, 17 July 2025 (UTC)		First-year chem lab on purification by recrystallization. We started with human gallstones — I don't recall if we had the actual "stones" and crushed them or even just dissolved them whole, or started with the powdered material. This material was dissolved in the smallest amount of boiling solvent that would do the job, giving a dark brown solution. The solution was cooled in an ice bath, and the cholesterol precipitated out (leaving some still in solution, which reduced the yield). The crystals were filtered out, very pale beige. The procedure was repeated, and the resulting crystals were white/colourless. One interesting observation was that the crystals that came out of the first stage were wide flat thin plates, but the second stage gave long needle-like crystals. Same materials, same solvent, same temperatures, same procedures and handling... but the concentrations of the impurities in solution completely changed how the crystals grew. [[User:BunsenH\|BunsenH]] ([[User talk:BunsenH\|talk]]) 17:13, 17 July 2025 (UTC)
		+
		+
		+	I would add that some fields like avionic and medicine are still allowed to use lead in solder because while lead is toxic, NOT using it could easily cost more lives in such cases. -- [[User:Hkmaly\|Hkmaly]] ([[User talk:Hkmaly\|talk]]) 23:07, 22 July 2025 (UTC)

@@ Line 13: / Line 13: @@
 ::Because it absolutely ''refuses'' to be in any way vulnerable to scissors! [[Special:Contributions/92.23.2.228|92.23.2.228]] 22:55, 15 July 2025 (UTC)
 ::If we can't explain why metal grows hair, why would you think we could explain why rocks don't? [[User:DL Draco Rex|DL Draco Rex]] ([[User talk:DL Draco Rex|talk]]) 19:23, 16 July 2025 (UTC)
 If you look closely where it says ‘precise’, it looks like Randall traced it! [[User:Broseph|Broseph]] ([[User talk:Broseph|talk]]) 12:44, 15 July 2025 (UTC)

← Older revision		Revision as of 17:13, 17 July 2025
Line 21:		Line 21:

	A rare case where gallium is the somewhat normal behaving metal. [[User:RegularSizedGuy\|RegularSizedGuy]] ([[User talk:RegularSizedGuy\|talk]]) 13:00, 16 July 2025 (UTC)		A rare case where gallium is the somewhat normal behaving metal. [[User:RegularSizedGuy\|RegularSizedGuy]] ([[User talk:RegularSizedGuy\|talk]]) 13:00, 16 July 2025 (UTC)
		+
		+	First-year chem lab on purification by recrystallization. We started with human gallstones — I don't recall if we had the actual "stones" and crushed them or even just dissolved them whole, or started with the powdered material. This material was dissolved in the smallest amount of boiling solvent that would do the job, giving a dark brown solution. The solution was cooled in an ice bath, and the cholesterol precipitated out (leaving some still in solution, which reduced the yield). The crystals were filtered out, very pale beige. The procedure was repeated, and the resulting crystals were white/colourless. One interesting observation was that the crystals that came out of the first stage were wide flat thin plates, but the second stage gave long needle-like crystals. Same materials, same solvent, same temperatures, same procedures and handling... but the concentrations of the impurities in solution completely changed how the crystals grew. [[User:BunsenH\|BunsenH]] ([[User talk:BunsenH\|talk]]) 17:13, 17 July 2025 (UTC)

← Older revision		Revision as of 13:00, 16 July 2025
Line 18:		Line 18:
	dagger-shaped object precipitated within the wound		dagger-shaped object precipitated within the wound
	[[User:KingPenguin\|KingPenguin]] ([[User talk:KingPenguin\|talk]]) 02:19, 16 July 2025 (UTC)		[[User:KingPenguin\|KingPenguin]] ([[User talk:KingPenguin\|talk]]) 02:19, 16 July 2025 (UTC)
		+
		+	A rare case where gallium is the somewhat normal behaving metal. [[User:RegularSizedGuy\|RegularSizedGuy]] ([[User talk:RegularSizedGuy\|talk]]) 13:00, 16 July 2025 (UTC)

@@ Line 16: / Line 16: @@
 The zinc whiskers are similar to joke in [[3112: Geology Murder]] where the
-  'dagger-shaped object precipitated within the wound"
+  dagger-shaped object precipitated within the wound
 [[User:KingPenguin|KingPenguin]] ([[User talk:KingPenguin|talk]]) 02:19, 16 July 2025 (UTC)

← Older revision		Revision as of 08:02, 16 July 2025
Line 16:		Line 16:

	The zinc whiskers are similar to joke in [[3112: Geology Murder]] where the		The zinc whiskers are similar to joke in [[3112: Geology Murder]] where the
−	'dagger-shaped object precipitated within the wound" [[User:KingPenguin\|KingPenguin]] ([[User talk:KingPenguin\|talk]]) 02:19, 16 July 2025 (UTC)	+	'dagger-shaped object precipitated within the wound"
		+	[[User:KingPenguin\|KingPenguin]] ([[User talk:KingPenguin\|talk]]) 02:19, 16 July 2025 (UTC)

← Older revision		Revision as of 02:19, 16 July 2025
Line 14:		Line 14:

	If you look closely where it says ‘precise’, it looks like Randall traced it! [[User:Broseph\|Broseph]] ([[User talk:Broseph\|talk]]) 12:44, 15 July 2025 (UTC)		If you look closely where it says ‘precise’, it looks like Randall traced it! [[User:Broseph\|Broseph]] ([[User talk:Broseph\|talk]]) 12:44, 15 July 2025 (UTC)
		+
		+	The zinc whiskers are similar to joke in [[3112: Geology Murder]] where the
		+	'dagger-shaped object precipitated within the wound" [[User:KingPenguin\|KingPenguin]] ([[User talk:KingPenguin\|talk]]) 02:19, 16 July 2025 (UTC)