Sea Level! What is it and how do scientists calculate it? As it turns out, there are actually many complexities in determining this measurement. For example, Earth isn’t actually a sphere, gravity is stronger and weaker at different points around the globe, and of course, there are a lot of mountains that are no where near water — so how do we know what sea level would be? In this video, Minute Physics explains the details.
From Edutopia, this is the story of a high school student who brought his hobby — growing food with an aquaponic system for his family and neighbors — to his school’s underutilized greenhouse, creating a local edible schoolyard for his fellow students and his community. And he’s not stopping there:
"I want to bring this system into many different schools. You know, learning opportunity that a system like this provides is immense. You’ve got water chemistry, agriculture, science, physics, mathematics, economics. A lot of these subjects could be modeled from this particular system. If I can provide a curriculum to go with this system then the knowledge of aquaponics will be proliferated throughout, hopefully, the United States."
In the year 2020, seven of the largest mirrors on Earth — 20 tons each — will come together in a 22-story, rotating building located in the southern Atacama Desert of Chile. They will form the Giant Magellan Telescope, a feat of science, technology, engineering and math that will have ten times the resolution of the Hubble Space Telescope.
In this video from July 2013, Dr. Wendy Freedman, Chairman GMT, and Dr. Pat McCarthy, Director GMT, explain the astounding challenge of creating this precise, powerful, and wondrous machine. Read more at Phys.org.