The physics of the “hardest move” in ballet – Arleen Sugano

In the third act of “Swan Lake”, the Black Swan pulls off a seemingly endless series of turns, bobbing up and down on one pointed foot and spinning around and around and around … thirty-two times. How is this move — which is called a fouetté — even possible? Arleen Sugano unravels the physics of this famous ballet move.

Lesson by Arlene Sugano, animation by Dancing Line Productions.

Scientists discover a sixth sense on the tongue—for water | Science | AAAS

New study in mice sheds light on how animals stay hydrated

Viewed under a microscope, your tongue is an alien landscape, studded by fringed and bumpy buds that sense five basic tastes: salty, sour, sweet, bitter, and umami. But mammalian taste buds may have an additional sixth sense—for water, a new study suggests. The finding could help explain how animals can tell water from other fluids, and it adds new fodder to a centuries-old debate: Does water have a taste of its own, or is it a mere vehicle for other flavors?

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Source: Scientists discover a sixth sense on the tongue—for water | Science | AAAS

Teacher Demos: A. Digestive enzymes, B. Control of Breathing, C. Baroreceptor Reflex


These three demos allow students to experience applications of knowledge of the digestive, respiratory, and circulatory systems by doing very short activities on themselves.   They also allow the opportunity to discuss the pros and cons of using humans as test subjects.  It is very useful for students to get the idea that scientific experiments do not have to be very complicated. Continue reading