ELi5 | SM
ELi5 | SM
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ELI5: Explain Like I'm 5, Season 1
ELI5 Explain Like I'm 5: Bite sized answers to stuff you should know about - in a mini podcast
When steel is heated up until it glows, its tiny internal “compasses” (called magnetic domains) get shaken up and lose any alignment they had.
As the steel cools back down while still inside a magnetic field like Earth’s, shaking the iron (by forging) while it cools helps lock those iron crystals into place, and the domains start to line up with the direction of the field.
Once the temperature drops below the Curie temperature (the point at which a material loses its permanent magnetism, roughly 770°C for steel), the domains become locked in their new positions.
This means the steel keeps a “memory” of the magnetic field it cooled in, effectively making it magnetic in that direction, even after it returns to room temperature.
This is why scientists studying Earth’s history can look at rocks’ magnetism and tell which direction the magnetic field was pointing millions of years ago: those rocks picked up TRM from cooling in alignment with ancient magnetic fields, just like forged steel does.
📹- @valhallaironworks (Posted with permission)
22Imagine standing in the middle of a football stadium at night: if there’s just one spotlight, your shadow is big and dark. But when bright lights surround the whole stadium, every direction sends light at you, and any shadow gets filled in by light coming from the other side, so your shadow almost disappears.
In the operating room, multiple lamps and special diffusers spread light from many angles.
So even if the surgeon’s hands or tools block one part of the light, the others fill in the darkness, letting surgeons see everything clearly with no distracting shadows - just like how players can see every part of the field even with people running everywhere under stadium lighting.
📹- @progressivespine (Posted with permission)
22Once breathing is under control, the next priority is to get back onto the ice rather than trying to swim forward. The ice around the hole you fell through is weakest behind you but usually stronger in the direction you came from, as it already supported your weight once. By spreading your arms wide on the ice edge and gently kicking your legs, you can use your body like a seal sliding onto land. The aim is to distribute weight over a larger area so the ice does not break again.
After getting out, standing up immediately can cause the ice to crack again. Rolling or crawling away from the hole keeps weight spread out until you reach thicker, safer ice or solid ground. Wet clothes will rapidly lower body temperature, so reaching shelter and removing them as soon as possible is vital. Hypothermia can continue even after rescue, so warming the body gradually and seeking medical help is important, even if the person feels fine at firs
22The science behind why steel becomes magnetic when forged in the direction of Earth's magnetic field is rooted in what scientists call thermoremanent magnetization (TRM).
When steel is heated up until it glows, its tiny internal “compasses” (called magnetic domains) get shaken up and lose any alignment they had.
As the steel cools back down while still inside a magnetic field like Earth’s, shaking the iron (by forging) while it cools helps lock those iron crystals into place, and the domains start to line up with the direction of the field.
Once the temperature drops below the Curie temperature (the point at which a material loses its permanent magnetism, roughly 770°C for steel), the domains become locked in their new positions.
This means the steel keeps a “memory” of the magnetic field it cooled in, effectively making it magnetic in that direction, even after it returns to room temperature.
This is why scientists studying Earth’s history can look at rocks’ magnetism and tell which direction the magnetic field was pointing millions of years ago: those rocks picked up TRM from cooling in alignment with ancient magnetic fields, just like forged steel does.
📹- @valhallaironworks (Posted with permission)
6 months ago
Surgical lights don’t cast visible shadows because they use many light sources arranged in a ring - just like stadium lights shining from all sides of a playing field.
Imagine standing in the middle of a football stadium at night: if there’s just one spotlight, your shadow is big and dark. But when bright lights surround the whole stadium, every direction sends light at you, and any shadow gets filled in by light coming from the other side, so your shadow almost disappears.
In the operating room, multiple lamps and special diffusers spread light from many angles.
So even if the surgeon’s hands or tools block one part of the light, the others fill in the darkness, letting surgeons see everything clearly with no distracting shadows - just like how players can see every part of the field even with people running everywhere under stadium lighting.
📹- @progressivespine (Posted with permission)
6 months ago
Falling into frozen water is dangerous primarily because the cold shocks the body and steals heat very quickly, but survival is possible if actions are calm and deliberate. The first reaction of the body is an involuntary gasp and rapid breathing caused by cold shock. This makes it essential to resist panic and focus on slow, controlled breaths. Keeping the head above water and avoiding wild movements helps prevent inhaling water and conserves energy during the most critical first seconds.
Once breathing is under control, the next priority is to get back onto the ice rather than trying to swim forward. The ice around the hole you fell through is weakest behind you but usually stronger in the direction you came from, as it already supported your weight once. By spreading your arms wide on the ice edge and gently kicking your legs, you can use your body like a seal sliding onto land. The aim is to distribute weight over a larger area so the ice does not break again.
After getting out, standing up immediately can cause the ice to crack again. Rolling or crawling away from the hole keeps weight spread out until you reach thicker, safer ice or solid ground. Wet clothes will rapidly lower body temperature, so reaching shelter and removing them as soon as possible is vital. Hypothermia can continue even after rescue, so warming the body gradually and seeking medical help is important, even if the person feels fine at firs
6 months ago