Google: Links Have Less Impact Today Than In The Past
A Googler shared that links as a signal have less impact than when Google first started
When the Sahara Was Green
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The climate of the Sahara was completely different thousands of years ago. And we’re not talking about just a few years of extra rain. We’re talking about a climate that was so wet for so long that animals and humans alike made themselves at home in the middle of the Sahara.
Big thanks to Fabrizio De Rossi for the reconstructions of the Sahara past and present. Check out more of Fabrizio’s work at https://www.facebook.com/ArtofFabricious/
Produced in collaboration with PBS Digital Studios: http://youtube.com/pbsdigitalstudios
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What causes insomnia? – Dan Kwartler
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What keeps you up at night? Pondering deep questions? Excitement about a big trip? Stress about unfinished work? What if the very thing keeping you awake was stress about losing sleep? This seemingly unsolvable loop is at the heart of insomnia, the world’s most common sleep disorder. So what is insomnia? And is there any way to break the cycle? Dan Kwartler details the science of insomnia.
Lesson by Dan Kwartler, animation by Sharon Colman.
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Proof of evolution that you can find on your body
You have your mom’s smile, your dad’s eyes, and the ear muscles of a Triassic mammal.
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Vestigial structures are evolution’s leftovers — body parts that, through inheritance, have outlived the context in which they arose. Some of the most delightful reminders of the common ancestry we share with other animals, they show that the building blocks of the human body predate our species by hundreds of millions of years.
Forty-two percent of Americans say that humans were created in their present form within the past 10,000 years — a percentage that hasn’t changed much since 1982, when Gallup started polling views on evolution.
Several lines of evidence, from the fossil record, comparative anatomy, and genetics, tell another story. But you don’t have to read all the research to find signs of our evolutionary history — you can see it in the vestigial structures in each of our bodies, like the third molars that no longer fit in our mouths. For a few other examples, check out the video above.
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Does Google remove the PageRank coming from links on pages that no longer exist?
Robert Enriquez from Charlotte asks: “Websites lose back links due to other websites going out of business or closing (Geocities, AOL, member pages). Does Google remove the back link juice that once came from these pages?”