Group items matching

in title, tags, annotations or url

Euglena and eyespots explained

Your mother's DNA may have determined your eye color, but some traits that you thought came from her may instead have come from the DNA of bacteria she passed on to you soon after birth, a new study finds. The study found that a mother mouse can pass along to her offspring a susceptibility to intestinal disorders, such as inflammatory bowel disease, by way of a gut-residing bacterium called Sutterella, the researchers reported in the journal Nature on Feb. 16.

Links to teacher's guide for October articles Eating with your eyes: The Chemistry of Food Colorings Tooth Decay: A Delicate Balance Probiotics: Good bactria good health Dirt? Who needs it? How hydroponics is poised to change the world Light in the cellar of the sea

In the 1950s, Idaho sheep ranchers had a problem. About a quarter of their lambs were being born dead or deformed-sometimes with a single eye centered in the middle of their forehead, like the Cyclops of Greek legend, or missing their upper jaw. There were times when the pregnant ewes couldn't give birth at all, carrying the mutated fetuses until they were surgically delivered or the ewes themselves died. Unbeknownst to the farmers, the cause was a poisonous plant, western false hellebore (Veratrum californicum). Eventually, the plant would inspire a successful cancer therapy-but at the time, the sheep were what mattered.

On July 26, 1943, Los Angeles was blanketed by a thick gas that stung people's eyes and blocked out the Sun. Panicked residents believed their city had been attacked using chemical warfare. But the cloud wasn't an act of war. It was smog. So what is this thick gray haze actually made of? And why does it affect some cities and not others? Kim Preshoff details the science behind smog.

hat is color blindness? A color festival. No. Color blindness or color deficiency is a vision problem. Now, our eyes have light sensitive cells called rods and cones. Can I put ice cream on these cones? You are just unbelievable. Rods are responsible for black and white vision. They do not detect color. Whereas, cones detect color. There are three types of cones. One cone perceives red light, another perceives green and the third perceives blue. Together, these cones help us to see the whole spectrum of colors. Now in some cases, when one or more types of cones do not work properly, it causes color blindness. People with such deficiency have difficulty in distinguishing between certain colors or shades. For example, in red-green color blindness, the apple tree may appear like this.

BLOSSOMS video lessons are enriching students' learning experiences in high school classrooms from Brooklyn to Beirut to Bangalore. Our Video Library contains over 50 math and science lessons, all freely available to teachers as streaming video and Internet downloads and as DVDs and videotapes.

269 page  Curriculum Supplement from NIH 5 lessons  Ideas about the role of evolution in medicine Investigating lactose intolerance and evolution evolutionary processes and patterns inform medicine Using evolution to understand influenza Evaluating evolutionary explanations

A few years ago I was taking a tour of a dome shaped house, and the architect explained to me that domes are an optical illusion. Whenever someone enters a room, their eyes inadvertently glance up at the corners of the room to give them the contextual dimensions of the space they're in.