(2) c

During World War II, radium based luminous paint was considered a breakthrough technology because it allowed instruments to glow continuously in complete darkness without needing electricity or an external light source. Radium paint had actually been developed earlier in the 1910s, but the military relied on it heavily during the war because night operations became critical for aircraft, ships, submarines and ground equipment. Radium luminous paint was made by mixing small amounts of Radium‑226 with a phosphorescent material such as zinc sulfide and a binder like varnish or lacquer. Radium-226 is radioactive, emitting alpha, beta and gamma radiation which made it slightly hazardous to handle but did not cause the paint to glow, the visible light comes solely from the phosphor. The glow however faded over time because the phosphorescent material naturally degraded. In many instruments, brightness dropped significantly after roughly 10–20 years, even though the radium itself remained radioactive for thousands of years (half-life about 1,600 years). Because of this property, the military used radium paint on many critical instruments where visibility at night was essential. It was applied to aircraft instrument panels (altimeters, airspeed indicators, compasses), naval navigation equipment, submarine gauges, gyroscopes, bomb sights, cockpit switches and wristwatches issued to soldiers and pilots. It was also used on gunsights, range finders and some vehicle dashboards. The reason was simple actually, pilots and operators needed to read instruments instantly in total darkness without turning on lights that could reveal their position to enemy forces. By the late 1950s and 1960s, radium paint was gradually replaced by safer alternatives like Tritium, Promethium‑147, and non-radioactive photoluminescent paints made from zinc sulfide or strontium aluminate. Many surviving WWII instruments and watches still contain radium paint today. While the glow often faded decades ago as the phosphor degraded, the radium itself is still radioactive which is why antique collectors and museums handle these items with caution. ☢️

The Hangman (1964)

BALATRO PORN ON MY TIMELINE

Thanks to the amazing digital circus, now there is such a thing such as an "i have no mouth an i must scream" larpers

What will the Tate brothers be remembered for?

FUN FACT—helium cools the superconducting magnets in more than 14,000 MRI machines used in hospitals worldwide. We lost the largest helium extraction plant in the world in Qatar. US reserves running low. Helium cannot be produced de novo. Any helium escape is permanent.

Marriage tip: when your wife tells you to grab her a glass of water before bed, bring her this.

Dream blunt rotation