cross-posted from: https://lemm.ee/post/64402838

TLDR:

• Theoretical and experimental evidence now strongly supports the possibility of energy extraction from spinning objects, including black holes.

• Creating a “black hole bomb” is no longer just science fiction—lab-scale analogs exist.

• Realizing a full-scale version (especially around a real black hole) is still far in the future, but the groundwork is being laid.

Main Idea

It is theoretically and experimentally possible to extract energy from spinning black holes, and under specific conditions, this could be amplified to create what’s known as a “black hole bomb.”

Theoretical Background

Penrose Process (1969)

• Proposed by Roger Penrose.

• Energy can be extracted from a spinning black hole via its ergosphere.

• The ergosphere is a region just outside the event horizon where spacetime is dragged due to the black hole’s spin.

• Inside this region:

  • Objects cannot remain stationary.
  • Energy can be gained if mass is ejected in the right way.
  • A spacecraft, for instance, could enter the ergosphere and leave with more energy than it had.

Zeldovich Effect (1971)

• Proposed by Yakov Zeldovich.
• Rotating bodies (not just black holes) can amplify electromagnetic waves via rotational energy.
• Predicted that light or sound aimed at a spinning object could gain energy upon reflection.
• Required extremely high rotational speeds—nearly relativistic—for noticeable effects.

Experimental Verification

Sound Waves (2020)

• Spinning absorptive disc increased the energy of low-frequency sound waves.
• Proved the Zeldovich effect using acoustics.

Electromagnetic Waves (2023–2024)

• A spinning aluminum cylinder with surrounding magnetic coils showed energy amplification of EM waves.
• Rotation direction affected energy gain/loss.
• First real-world proof of the superradiance concept from Zeldovich's theory.

Black Hole Bomb Concept (1972)

Key Mechanism

• Enclose a spinning black hole (or any rotating energy source) with a reflective mirror.

• Waves bounce between the mirror and ergosphere, each time gaining energy from the black hole’s spin.

• This creates a positive feedback loop:

  • Energy builds exponentially.
  • Could result in an enormous explosion (i.e., a “black hole bomb”).
  • Or energy could be released in a controlled burst, like a black hole plasma gun.

Recent Experiments (2024)

• Miniature black hole bomb analog was created:

  • A metal cylinder was rotated.
  • Surrounded by coils acting as magnetic mirrors.
  • EM waves were amplified exponentially when rotation threshold was met.
  • Verified theoretical predictions experimentally for the first time.

Challenges & Future Research

For Actual Black Holes

• Creating a real reflective mirror around a black hole is still theoretical.
• Stabilizing such a structure near a black hole is currently beyond our technology.

Next Step: Quantum Foam

• Researchers aim to attempt amplification using quantum vacuum energy (quantum foam).

• If successful:

  • Could demonstrate energy extraction from spacetime itself.
  • Would confirm another Zeldovich prediction.
  • Potential Nobel Prize-level breakthrough.

source

The full story is here, but this was one of the most substantial legal civil rights victories in American history, and one of the scant few that ever occurred to obtain legal recourse against US abuses of native people.

In 1969, he wrote a short story titled “A Boy and His Dog,” which tells the tale of a 15-year-old wasteland scavenger named Vic and his telepathic dog Blood. The story was also adapted into a 1975 film, which Fallout designer Jesse Heinig told The Escapist in 2009 "inspired Fallout on many levels" (including Dogmeat's name, which was taken from a nickname Vic gives Blood in the film).

It also influenced "Love and Monsters" (2020)

https://editorial.rottentomatoes.com/article/lq-jones-on-a-boy-and-his-dog-the-rt-interview/

And Mad Max.

Oh, and the dog is the same dog that was "Tiger" on "The Brady Bunch"

cross-posted from: https://lemmit.online/post/5831395

This is an automated archive made by the Lemmit Bot.

The original was posted on /r/todayilearned by /u/GoCartMozart1980 on 2025-05-15 14:58:41+00:00.

The Turner Doomsday Video is the internal title of an apocalypticism video intended to be broadcast by CNN at the end of the world. The video, created at the direction of CNN founder Ted Turner before the network's 1980 launch, is a performance of the Christian hymn "Nearer, My God, To Thee" performed by multiple members of the U.S. Army, Navy, Air Force, and Marine bands.

It was never seen by the public until it was leaked in 2015 by a former intern.

Link to the video: https://youtu.be/vvxwIKTOIeY

The idea was to produce the Master Race.

The brilliant @zdl@ttrpg.network has been doing a series in !WomensStuff@lazysoci.al about unknown kick ass women from history. This is my favourite, she fought alongside men from her tribe and was a fierce protector for her people. The post is too good to keep to myself!

*PLEASE NOTE WOMENSSTUFF IS A TRANS+ AND NON BINARY INCLUSIVE WOMENS ONLY COMMUNITY, MEN PLEASE DO NOT COMMENT

Her husband supported her, and part of her reasoning was that women would prefer a female doctor.

Pretty cool lady

How would you name your own country?

cross-posted from: https://lemmit.online/post/5774540

This is an automated archive made by the Lemmit Bot.

The original was posted on /r/todayilearned by /u/ICanStopTheRain on 2025-05-07 03:51:37+00:00.

Original Title: TIL that in 1975, after Gillette introduced a two-blade cartridge razor, Saturday Night Live aired a fake commercial for a three-blade razor. Gillette introduced one in 1998. In 2004, a satirical article in The Onion introduced a fictional five-blade razor. A real five-blade razor came out in 2006.

Two cases of rabies have been attributed to probable aerosol exposures in laboratories, and two cases of rabies have been attributed to possible airborne exposures in caves containing millions of free-tailed bats (Tadarida brasiliensis) in the Southwest. However, alternative infection routes cannot be discounted.

It's real, they did an article about him. This was supposed to be a soft piece to make him more human. ha ha.