Please create an account to participate in the Slashdot moderation system


Forgot your password?
Last Chance - Get 15% off sitewide on Slashdot Deals with coupon code "BLACKFRIDAY" (some exclusions apply)". ×

Submission + - Purported Relativity Paradox Resolved (

sciencehabit writes: A purported conflict between the century-old theory of classical electrodynamics and Einstein's theory of special relativity doesn't exist, a chorus of physicists says. Last April, an electrical engineer claimed that the equation that determines the force exerted on an electrically charged particle by electric and magnetic fields—the Lorentz force law—clashes with relativity, the theory that centers on how observers moving at a constant speed relative to one another will view the same events. To prove it, he concocted a simple "thought experiment" in which the Lorentz force law seemed to lead to a paradox. Now, four physicists independently say that they have resolved the paradox.

Submission + - DIY BioPrinter Hack Lets You Print Biomaterials Using an Old Inkjet (

MikeChino writes: Instructables member Patrik has successfully transformed an old HP5150 inkjet printer into a DIY bioprinter. To do this he removed the plastic covers and panels and rewired the paper handling mechanism. Then he prepped ink cartridges to be able to handle biological materials by opening the lid, removing the ink, and washing it out with deionized water. For his first experiment, he printed a simple solution of arabinose onto filter paper.

Submission + - Alfred Russel Wallace: what I really thought about Darwin (

Calopteryx writes: The correspondence of Alfred Russel Wallace has gone online for the first time ( New Scientist has opened a wormhole between the 21st and 19th centuries and has "interviewed" the great man

"Consider a spherical bear, in simple harmonic motion..." -- Professor in the UCB physics department