Human bodies aren’t built for extreme aging: our capacity is set at about 90 years. But what does aging really mean, and how does it counteract the body’s efforts to stay alive? Monica Menesini details the nine physiological traits that play a central role in aging.
Lesson by Monica Menesini, animation by Cinematic.
View full lesson: http://ed.ted.com/lessons/why-do-our-…
One of the basic tenets of cell theory is that “all cells only arise from pre-existing cells.” In fact, new cells are formed by the process of cell division, which gives two genetically identical daughter cells.
This activity provides detailed instructions for students to observe mitosis in plant cells.
Click here to download the complete instructions
Across the planet, humans eat on average between 1 and 2.7 kilograms of food a day, and every last scrap makes its way through the digestive system. Comprised of ten organs covering nine meters, this is one of the most complicated systems in the body. Emma Bryce explains how the different parts of the digestive system work to transform your food into the nutrients and energy that keep you alive. Continue reading
Snowflakes are infinitely beautiful, but are they infinitely unique? Here’s all the science behind Earth’s favorite cold crystal. Continue reading
In this demo, the teacher creates a beautiful rainbow of colours in a demonstration tube using universal indicator and a dilute
acid and base.
Universal indicator can be used to illustrate an entire range of pH conditions because it is made up of a mixture of different
indicators that change colour at different pH values. As an acid is diluted with water, its pH increases—but never above pH 7.
Likewise, as a base is diluted, its pH decreases—but, again, never below pH 7. Continue reading
Sugar is delicious, sweet and… perfect for creating colorful, beautiful ornaments? Continue reading
Over a hundred years ago, the Titanic sank beneath the Atlantic Ocean in less than three hours. Hailed as the most beautiful ship of her time, Titanic’s short-lived life was full of luxury. This video will explore some little-known facts about this unsinkable story. Continue reading
Autoclave, Bleach or Biohazard Bag?
Biology, microbiology and biochemistry labs may generate wastes that must be managed as potentially infectious, biohazardous or regulated medical waste. Continue reading