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David Freeman

Entries by David Freeman

Say Hello To Spinosaurus, A Huge Alien-Like Dinosaur That Actually Knew How To Swim

(19) Comments | Posted September 11, 2014 | 5:12 PM

Of the hundreds of types of dinosaurs that have been discovered, none has ever been shown to have been adapted for life in the water. But now an international team of scientists says a species called Spinosaurus aegyptiacus was the first truly semiaquatic dinosaur -- and...

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These 'Smart Headlights' Aim To Make Nighttime Driving Way Safer—Even In Rain & Snow

(16) Comments | Posted September 11, 2014 | 8:42 AM

Talk about a bright idea!

Researchers at Carnegie Mellon University in Pittsburgh say they've developed "smart headlights" that provide bright illumination of the road ahead without blinding the motorists in oncoming vehicles.

The still-experimental headlights work by tracking oncoming vehicles in the vicinity and then...

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Hypnotic Little Video Uses Bowling Balls To Demonstrate Basic Physics

(13) Comments | Posted September 10, 2014 | 12:31 PM

Everyone knows bowling balls are for knocking things down. But it turns out they're also pretty good at shoring up our knowledge of basic physics. Just have a look at this strangely hypnotic YouTube video showing a line of bowling balls on strings swinging back and forth like...

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Popular Theory About Volcanoes Is All Wrong, Scientists Say

(68) Comments | Posted September 10, 2014 | 9:49 AM

Have scientists had volcanoes all wrong?

A popular theory has it that, at least in certain types of volcanos, eruptions occur when molten rock known as magma gushes up from deep inside the earth via narrow jets known as mantle plumes. But a new study of...

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Ancient Soil Shows Oxygen-Producing Life Existed Way Earlier Than We Thought

(20) Comments | Posted September 8, 2014 | 10:05 AM

It may be time to rewrite geology textbooks.

Geologists say they've found evidence that oxygen-producing life existed on Earth some 3.02 billion years ago--60 million years earlier than previously thought.

"This is a very exciting finding, which helps to fill a gap in our knowledge...

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Handsome Men Have Poorer Sperm Quality, New Study Shows

(57) Comments | Posted September 8, 2014 | 8:26 AM

Sure, he looks good. But how about his sperm?

That might not be such a ridiculous-sounding question, now that a new study has identified a link between men's facial attractiveness and the quality of their semen--with handsome, masculine-looking guys having slightly lower-quality semen than other men.


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Marijuana Study Raises New Concerns About Pot Addiction In Teens

(78) Comments | Posted September 5, 2014 | 2:28 PM

Marijuana may be gaining acceptance around the nation, but that doesn't mean medical research has stopped raising questions about its safety.

Case in point: a new study on teens that suggests marijuana dependence may be a bigger problem than many people realize.

For the small-scale study,...

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Feynman Lectures On Physics Now Available Online Free Of Charge

(22) Comments | Posted September 2, 2014 | 12:51 PM

From his work on the Manhattan Project to the key role he played in explaining the Space Shuttle Challenger disaster, Richard Feynman (1918-1988) is known for many things. But to generations of students, the late physicist is perhaps best known as the brain behind The Feynman...

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Freaky Physics Experiment May Prove Our Universe Is A Two-Dimensional Hologram

(342) Comments | Posted August 29, 2014 | 8:22 AM

Everyone knows the universe exists in three dimensions, right? Maybe not. For some time now serious physicists have been pondering the seemingly absurd possibility that three-dimensional space is merely an illusion--and that we actually live in a two-dimensional "hologram."

And now scientists at the Fermi National Accelerator Laboratory...

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Earth's Mantle Isn't Quite What We Thought It Was, Study Shows

(173) Comments | Posted August 28, 2014 | 1:50 PM

Maybe we were mistaken about Earth's mantle, the layer of our rocky planet that lies between its core and the thin crust on which we live.

For years, earth scientists were convinced that the mantle's entire lower region--which stretches from 400 to 1,800 miles below the surface--was...

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Scientists Create Working Organ From Scratch For First Time Ever

(80) Comments | Posted August 25, 2014 | 2:16 PM

In what's being hailed as a scientific first, researchers in Scotland have created a fully functional organ from scratch inside the body of a living animal.

The feat--the creation of a working thymus gland from "reprogrammed" embryonic cells--is seen as an important step toward the development of...

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Here's How To Steady A Wobbly Table Using Nothing But Math

(8) Comments | Posted August 20, 2014 | 8:55 AM

Wedging a piece of folded paper under a leg is one way to steady a wobbly table. But did you know it's possible to stop the wobble using nothing but mathematics? That's the surprising takeaway of a charming new video posted on Numberphile's YouTube channel.

"Mathematicians never have...

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One Of The Oddest Fossils Ever Found Is Finally Linked To Living Animals

(54) Comments | Posted August 18, 2014 | 3:49 PM

A fossil considered one of the oddest ever found may finally have its proper place in evolutionary history. New research conducted at the University of Cambridge in England links the weird legged worm known as Hallucigenia to modern velvet worms, wormlike animals that live...

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Scary Shark Attack Video Shows Just How Violent Great Whites Can Be

(87) Comments | Posted August 6, 2014 | 3:03 PM

What's it like to be attacked by a Great White shark? Now's your chance to find out--and you don't have to risk life and limb.

A scary new video from the Woods Hole Oceanographic Institution spotlights the moment when the giant fish closes its big...

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John Venn's Birthday Celebrated In Clever Google Doodle (VIDEO)

(1) Comments | Posted August 4, 2014 | 2:04 PM

Have you seen today's Google Doodle? It's a clever interactive animation to mark the 180th birthday of John Venn, the English logician and philosopher responsible for the Venn diagram.

As Venn wrote in his 1880 article "On the Diagrammatic and Mechanical Representation of...

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Neil deGrasse Tyson Says Media Misled Over Speed Of Light Story

(300) Comments | Posted August 1, 2014 | 3:06 PM

Were physicists all wrong about the speed of light? You might think so, given the stories posted recently about a new paper suggesting that light travels a bit more slowly than the 186,000-miles-a-second figure that's familiar to generations of science geeks.

The paper's author, University of...

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Why Do Dogs Sniff Each Other's Butts? It's More Complicated Than You Might Imagine

(76) Comments | Posted July 28, 2014 | 2:40 PM

Why do dogs sniff each other's butts? The answer to that question is a bit more complicated than you might imagine.

According to a new video from the American Chemical Society (above), it's all about one canine literally sniffing out important information about the other--its gender, emotional...

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These 'X-Rated' Math Terms Sound Dirty But Aren't Really

(32) Comments | Posted July 2, 2014 | 8:37 AM

For some people, math is a four-letter word. But even if you're comfortable talking equations, you might be a bit squeamish when making reference to math terms with names that sound X-rated.

Here are six math terms that sound dirty but aren't (see list below). The explanations...

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Huge Black Hole At Galaxy's Heart Has A Severe Case Of Gas

(143) Comments | Posted June 25, 2014 | 2:59 PM

Call it a severe case of gas--on a cosmic scale.

Data from multiple space observatories show that gas is spewing at very high speed from the supermassive black hole at the heart of a galaxy some 245 million light-years from Earth.

The discovery comes as a bit...

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Try This Simple Meditation Method To Be Happier, Healthier & More Caring (PODCAST)

(6) Comments | Posted June 24, 2014 | 8:36 AM

As someone who has spent decades at the forefront of brain research, Dr. Richard J. Davidson is well acquainted with the organ's amazing power to think and to reason.

But the University of Wisconsin psychologist also knows that this cognitive virtuosity comes with a big downside.


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