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A project of CFACT. Tech, science, news and social issues for geeks. Tom's Guide: Your High-Tech Source of Information. Technology.

3D Printing

Science News – Science Articles and Current Events. Cleantech News — Solar, Wind, EV News (#1 Source) Deepcold. Atomic Rockets. Your imagination has been captured by the roaring rockets from Heinlein's SPACE CADET or the Polaris from TOM CORBETT, SPACE CADET.

Atomic Rockets

But are such rockets possible? How does one go about defining the performance of these atomic-powered cruisers? This document gives some hints and equations that will allow back-of-the-envelope calculations on such matters. Though horribly simplistic, they are far better than just making up your figures. This site was mainly intended for science fiction authors who wanted a little scientific accuracy so they can write SF "the way God and Heinlein intended" (Arlan Andrews's Law). The engine and the torchship pages explain how easily do some of the calculations using Nomograms. . While this site originally focused on rocketry equations, as you can see it has grown to encompass other topics of interest to SF authors and game designers. Bad Astronomy - Slate. A new paper just published in the prestigious Astrophysical Journal makes a stunning claim: There are 10 times as many galaxies in the Universe as we previously thought.

Bad Astronomy - Slate

At least. The total number comes in at about 2 trillion of them. Now, let me be clear. This doesn’t meant the Universe is 10 times bigger than we thought, or there are 10 times as many stars. I’ll explain—I mean, duh, it’s what I do—but to cut to the chase, what they found is that there are lots of teeny, faint galaxies very far away that have gone undetected. What the astronomers did was look at extremely deep images of the Universe taken in surveys, for example the Hubble Ultra Deep Field. That’s a lot of galaxies. Surveys like the UDF are limited. The astronomers who did this research had an interesting problem. The answer is two-fold. Those numbers change with distance. At the same time, these faint galaxies are easier to see close to us, and harder farther away.

Computers

History of Science Sourcebook. Environmental News, Commentary, Advice. - RichardDawkins.net. Pharyngula. Probably not.

Pharyngula

But the New York Times reports: A review of studies has found that the health benefits of infant male circumcision vastly outweigh the risks involved in the procedure. Actually, it doesn’t. Not at all. The paper is all about the frequency of circumcision in the US; this is the only real data in the paper, and notice that a good chunk of it is speculation. Prevalence of adult circumcision in the United States during the past 6 decades (1948-2010). It does toss in a table purporting to show the tremendous risks of not circumcising baby boys, but this is not new — these are the same sloppy data that the author has been peddling for over a decade.

The author is Brian Morris, better known as the Man Who Hates Foreskins. Take that first condition, the likelihood of urinary tract infections. Or look at his claim of much greater rates of HIV infection. Armed with this hunch, rather than set up a website I chose to do some research. Encyclopedia Astronautica. Wired.com.

The Skeptics Society & Skeptic magazine. Scientific American. Science News – Science Articles and Current Events. Journal home : Nature. Ted Erclik, Xin Li, Maximilien Courgeon, Claire Bertet, Zhenqing Chen, Ryan Baumert, June Ng, Clara Koo, Urfa Arain, Rudy Behnia, Alberto Del Valle Rodriguez, Lionel Senderowicz, Nicolas Negre, Kevin P.

Journal home : Nature

White & Claude Desplan + et al. Katarzyna Zaremba-Niedzwiedzka, Eva F. Caceres, Jimmy H. Geekologie - Gadgets, Gizmos, and Awesome.