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A major breakthrough in nuclear fusion has been confirmed a year after it was achieved at a laboratory in California.

Researchers at Lawrence Livermore National Laboratory’s (LLNL’s) National Ignition Facility (NIF) recorded the first case of ignition on August 8, 2021, the results of which have now been published in three peer-reviewed papers.

Nuclear fusion is the process that powers the Sun and other stars: heavy hydrogen atoms collide with enough force that they fuse together to form a helium atom, releasing large amounts of energy as a by-product. Once the hydrogen plasma “ignites”, the fusion reaction becomes self-sustaining, with the fusions themselves producing enough power to maintain the temperature without external heating.

Ignition during a fusion reaction essentially means that the reaction itself produced enough energy to be self-sustaining, which would be necessary in the use of fusion to generate electricity.

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Stock image of an atom. Results of nuclear fusion experiments that achieved ignition last year have no been confirmed in peer-reviewed papers. iStock / Getty Images Plus

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Save America from Trump

Save America from Trump

Save America from Trump

Save America from Trump

We won’t drink the kool-aid

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Doppelgängers share strikingly similar physical characteristics—they look so alike that, at times, these two unrelated people could easily pass for twins (or, at least, siblings).

Now, new research suggests that doppelgängers have more in common than meets the eye. People with very similar faces also share many of the same genes and lifestyle traits, according to a new paper published Tuesday in the journal Cell Reports.

It may seem obvious that people with similar facial features would also have some of the same DNA, but no one had scientifically proven this, until now. Thanks to the internet, it’s now easier than ever for researchers to track down and study doppelgängers.

To understand what was going on at the genetic level among look-alikes, scientists collaborated with the Canadian photographer François Brunelle. Since 1999, Brunelle has been traveling around the world to capture intimate portraits of strangers who look nearly identical to one another for his “I’m not a look-alike!” project.

Researchers asked 32 pairs of Brunelle’s models to answer questions about their lifestyles and submit samples of their DNA.

Using facial recognition software, the scientists analyzed headshots of the so-called “human doubles” and computed a score to quantify similarities among their faces. They compared the scores to those of identical twins and found that the software had awarded twin-like scores to exactly half of the doppelgänger pairs.

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Four pairs of “human doubles” included in the study Courtesy of François Brunelle

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If there’s one hallmark inherent to science, it’s that our understanding of how the Universe works is always open to revision in the face of new evidence. Whenever our prevailing picture of reality — including the rules it plays by, the physical contents of a system, and how it evolved from its initial conditions to the present time — gets challenged by new experimental or observational data, we must open our minds to changing our conceptual picture of the cosmos. This has happened many times since the dawn of the 20th century, and the words we use to describe our Universe have shifted in meaning as our understanding has evolved.

Yet, there are always those who cling to the old definitions, much like linguistic prescriptivists, who refuse to acknowledge that these changes have occurred. But unlike the evolution of colloquial language, which is largely arbitrary, the evolution of scientific terms must reflect our current understanding of reality. Whenever we talk about the origin of our Universe, the term “the Big Bang” comes to mind, but our understanding of our cosmic origins have evolved tremendously since the idea that our Universe even had an origin, scientifically, was first put forth. Here’s how to resolve the confusion and bring you up to speed on what the Big Bang originally meant versus what it means today.

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From a pre-existing state, inflation predicts that a series of universes will be spawned as inflation continues, with each one being completely disconnected from every other one, separated by more inflating space. One of these “bubbles,” where inflation ended, gave birth to our Universe some 13.8 billion years ago, where our entire visible Universe is just a tiny portion of that bubble’s volume. Each individual bubble is disconnected from all of the others, and each place where inflation ends gives rise to its own hot Big Bang.  Credit: Nicolle Rager Fuller)

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