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Riverworld.


Imagine a world stretched along a single, endless river inside a colossal space megastructure. Explore the fascinating concept of the Topopolis, a futuristic habitat billions of miles long, where humanity might thrive in a sprawling civilization bound by physics, engineering, and imagination.

Watch my exclusive video Big Alien Theory https://nebula.tv/videos/isaacarthur–… Nebula using my link for 40% off an annual subscription: https://go.nebula.tv/isaacarthur Get a Lifetime Membership to Nebula for only $300: https://go.nebula.tv/lifetime?ref=isa… Use the link gift.nebula.tv/isaacarthur to give a year of Nebula to a friend for just $30. Visit our Website: http://www.isaacarthur.net Join Nebula: https://go.nebula.tv/isaacarthur Support us on Patreon: / isaacarthur Support us on Subscribestar: https://www.subscribestar.com/isaac-a… Facebook Group: / 1,583,992,725,237,264 Reddit: / isaacarthur Twitter: / isaac_a_arthur on Twitter and RT our future content. SFIA Discord Server: / discord Credits: Topopolis: The Eternal River Episode 487a; February 23, 2025 Written, Produced & Narrated by: Isaac Arthur Graphics: Apogii.uk, Ken York YD Visual, Steve Bowers, Udo Scroeter Select imagery/video supplied by Getty Images Music Courtesy of Epidemic Sound http://epidemicsound.com/creator.

Rods of iron from God from the Moon – see why the US must beat China to the Moon for freedom, for survival.

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Humanity will eventually need somewhere to live on the Moon. While aesthetics might not be the primary consideration when deciding what kind of habitat to build, it sure doesn’t hurt. The more pleasing the look of the habitat, the better, but ultimately, the functionality will determine whether or not it will be built. Dr. Martin Bermudez thinks he found a sweet synergy that was both functional and aesthetically pleasing with his design for a spherical lunar habitat made out of blown glass. NASA apparently agrees there’s potential there, as he recently received a NASA Institute for Advanced Concepts (NIAC) Phase I grant to flesh out the concept further.

Bermudez’s vision’s artistic design looks like something out of an Arthur C. Clarke novel: a glass sphere rising off the lunar surface that could potentially contain living and work areas for dozens of people. His firm, Skyeports, is founded on creating these blown glass structures in space.

The design has some challenges, as Dr. Bermudez discusses in an interview with Fraser. First is how to build this thing. It’s far too large to ship in any conventional lunar lander. However, there’s also no air on the Moon to use as the blown gas to create the spherical shape. Dr. Bermudez plans to utilize argon, which would initially be shipped up from Earth to fill the sphere. Argon has several advantages in that it’s a noble gas and not very reactive, so it’s unlikely to explode in the furnace while the glass is blown.

A comprehensive video explaining quantum gravity.


HD 20,794D, An Earth like planet orbits a sun like star just 20 light years away. Watch and learn more.

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As temperatures drop, norovirus cases increase and more of its RNA ends up in sewage. This year, wastewater samples in the United States show norovirus levels have already passed the previous two seasonal peaks.


The “Ferrari of viruses” is having a banner season. Norovirus, which races through cruise ships, homes, and long-term care facilities, is experiencing a remarkable winter surge in the Northern Hemisphere, sending large numbers of people racing to the bathroom and many others to the hospital, and in rare cases, proving fatal. In the United States, for example, 91 outbreaks of the intestinal virus occurred in the first week of December 2024, far above the previous maximum, 65, for the same week between 2010 and 2024. And levels of its genes in U.S. wastewater are an order of magnitude above last year.

“The early data for the early part of the season is certainly supporting that we’re going to have a pretty intense norovirus year,” says Lisa Lindesmith, who studies the virus at the University of North Carolina (UNC) at Chapel Hill. Some of the surge may be due to a new variant of the virus, unfamiliar to many people’s immune systems, and the resumption of cruises and other gatherings that the COVID-19 pandemic interrupted. And there’s no vaccine anywhere in sight: The most advanced candidate just failed a key trial and others won’t be ready for several years.

Norovirus thrives in cold climes, causing explosive diarrhea and vomiting that typically only last for a day. But several weeks after people recover, they can still shed the virus, and it can remain infectious for long periods on surfaces. It’s notoriously resistant to many disinfectants, and studies in adult volunteers have shown just a trace of virus is enough to sicken a person. Oysters are also a source of infection, because the filter-feeding mollusks concentrate the virus from contaminated water in their tissues. U.S. health officials issued several warnings about infected oysters in December, and France has banned oyster harvesting in certain regions because of norovirus outbreaks.

Croatia’s first ever satellite has just beamed to Earth the first image of its homeland.

The satellite, called CroCube, is a 1U cubesat 3.3 by 3.3 by 3.3 inches (10 × 10 × 10 centimeters) in size. It launched to space aboard a SpaceX Falcon 9 rocket in late December on the company’s Bandwagon-2 rideshare mission.

You’re probably a bit tired by now of all this talk about private space stations coming from all over. Fatigue, most likely, does not come from the fact that several private companies are now working on this, because that’s very exciting, but from the fact that, despite the chatter, nothing significant seems to be happening.

You must take into account, though, that putting together a habitat that can safely house humans in space for long periods of time is not an easy task, and it requires millions invested and years spent on developing the required tech.

That means we’re likely still years away from seeing such a thing come to life. It turns out that we’ll not have to wait for too many years, though, as the first crewed flight to a private space station is now planned for 2026.