A.J.'s Time Travelers is a children’s book series created by author and educator A.J. Jacobs. The series features engaging stories that revolve around time travel, allowing young readers to explore historical events and figures in an entertaining way. Through the adventures of the main characters, readers learn about different cultures, important moments in history, and the lessons that can be gleaned from the past. The series aims to be both educational and fun, making history accessible and exciting for children.

The "Isaac Newton Gargoyle" refers to a sculptural representation of the famous mathematician and physicist Sir Isaac Newton, often depicted as a gargoyle or grotesque figure. This depiction can be found in various forms of art and architecture, typically in a whimsical or fantastical manner, blending Newton's historical significance with the imaginative aspects of gargoyle design.

"Me & Isaac Newton" is a song by the alternative rock band **Newton Faulkner** from their 2007 debut album, "Hand Built by Robots." The song features a catchy melody and thoughtful lyrics that reflect on themes of self-discovery and introspection. Newton Faulkner is known for his unique acoustic style, which blends various musical influences and showcases his skillful guitar work.

"Alternate Presidents" is a television series created by the streaming service HBO Max (now part of Max) that explores hypothetical scenarios in U.S. history, focusing on alternate outcomes of presidential elections and the impact that different leaders might have had on the nation. The show features various historical figures as they navigate political landscapes with a twist, providing a unique take on well-known events and decisions.

"Rubrique-à-Brac" is a French comic series created by the cartoonist Gotlib. It was first published in the magazine "L'Écho des Savannes" in the 1970s and later compiled into several albums. The name translates roughly to "miscellaneous" or "odds and ends," which reflects the series’ eclectic content and humor.

"Barbenheimer" is a portmanteau that emerged from the simultaneous release of two highly anticipated films in July 2023: "Barbie," directed by Greta Gerwig, and "Oppenheimer," directed by Christopher Nolan. The contrasting themes and tones of the two films—"Barbie" being a colorful, whimsical exploration of identity and feminism, and "Oppenheimer" being a serious biographical drama about J.

"Escape from Hell" is a novel written by the American author Larry Niven, published in 2009. The story serves as a sequel to Dante Alighieri's "Inferno" and explores themes of redemption, morality, and the consequences of one's actions. The plot follows a group of characters who find themselves in Hell and their attempts to escape it, drawing on Niven's characteristic blend of science fiction and fantasy elements.

"Super Columbine Massacre RPG!" is a video game created by the independent developer expressionist Jonason Pauley and released in 2005. The game is a controversial and polarizing work that attempts to address the Columbine High School shooting that occurred in April 1999. It is designed in the style of a role-playing game (RPG), reminiscent of classic 16-bit titles, and uses pixel art graphics.

TODO understand a bit more intuitively.

Two observers travel at fixed speed relative to each other. They synchronize origins at x=0 and t=0, and their spacial axes are perfectly aligned. This is a subset of the Lorentz group. TODO confirm it does not form a subgroup however.

Co-founder of PowerDNS, an open source dNS implementation.

Homepage: berthub.eu/ says:.
All stuff Ciro cares about too! Cool dude! In particular Ciro loved his quote of I should have loved biology.

He's writing a fun-sounding book about molecular biology as of 2022: berthub.eu/dna-book. Appears to be closed source though. Ciro wonders if he really needs to sell the book for money after all those years though, rather than just publishing it online for free.

Looking at Bert just brings the Dutch Golden Age, and more in particular Antonie van Leeuwenhoek to mind. Epic.

Generalization of orthogonal group to preserve different bilinear forms. Important because the Lorentz group is $SO(1,3)$.

Given a matrix $A$ with metric signature containing $m$ positive and $n$ negative entries, the indefinite orthogonal group is the set of all matrices that preserve the associated bilinear form, i.e.:Note that if $A=I$, we just have the standard dot product, and that subcase corresponds to the following definition of the orthogonal group: Section "The orthogonal group is the group of all matrices that preserve the dot product".

As shown at all indefinite orthogonal groups of matrices of equal metric signature are isomorphic, due to the Sylvester's law of inertia, only the metric signature of $A$ matters. E.g., if we take two different matrices with the same metric signature such as:and:both produce isomorphic spaces. So it is customary to just always pick the matrix with only +1 and -1 as entries.

Timeline:

"Paul Silver" could refer to a number of things depending on the context, as it's not a widely recognized term or figure. It might refer to a person's name, possibly someone in a specific field such as business, art, or entertainment. If you're thinking of a specific Paul Silver, providing more context would help narrow it down to the right reference. Alternatively, it could also be a brand, company, or concept.

Identity fusion is a psychological concept that refers to a strong, personal connection between an individual and a group, leading to a sense of oneness or unity with that group. This phenomenon goes beyond mere social identification, where individuals recognize themselves as members of a group—identity fusion involves a deep emotional bond that can significantly influence behavior and decision-making.

Linear motion refers to the motion of an object along a straight path. It can be described in terms of displacement, velocity, acceleration, and time. In linear motion, the position of an object changes in a straight line and can be characterized by the following key concepts: 1. **Displacement**: The shortest distance from the initial position to the final position of the object, which includes the direction of the movement.