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Teeth Resist Cracking

51; Here’s a story to share with your dentist.  You can crack a tooth, but it takes a lot of force.  This should be surprising, since tooth enamel is as brittle as glass.  The way the enamel develops, researchers found, absorbs excess energy and gives your teeth an extraordinary crack resistance.     “Human enamel […]

Your Inner Postal Service

51; Zip codes – those five- or nine-digit numbers on mail – have an analogue in every one of your cells.  Like a city,1 a cell has information to ship from place to place.2  To make sure that the manufacturing instructions for protein parts arrive at the appropriate assembly site, the shipper puts a molecular […]

Bacterial Flagellum Can Tune Its Swim Speed with Network-Controlled Brakes

51; What’s new with flagella?  These are the favorite toys of intelligent design supporters, because they are irreducibly complex molecular machines that evolutionists rarely attempt to explain by a Darwinian process.  More fodder for their position comes from a paper in Cell1 that finds that bacteria can fine-tune their swimming velocity by means of a […]

Bats Exhibit Aerodynamic Superiority

They may look clumsy fluttering around in the twilight air, but “Flexible, highly articulated wings give bats more options for flight than birds: more lift, less drag, greater maneuverability.”  Thus reads the caption to a picture of a bat in flight on a Brown University press release.  Researchers at Brown U are studying the differences […]

How and Why Whiskers Whisk

Scientists at Weizmann Institute found some interesting things about whiskers, reports EurekAlert.  While working with rats, they noticed that the whiskers are always in motion, twitching and sensing objects around them.  They discovered that two kinds of neurons are involved in sending whisker signals to the brain.  The “whisking” neurons are active all the time, […]

Live at the Improv: DNA Polymerase

When a DNA reader hits an unfamiliar line, it improvises, reports EurekAlert: Prof. Zvi Livneh and Ph.D. student Ayelet Maor-Shoshani of the Biological Chemistry Department cut a DNA strand — from the bacterium E. coli — and inserted material similar to that which composes crude oil in between both its ends.  As expected, the regular […]
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