This YouTube video, by a teacher, explains the purpose of a hypothesis and how to construct one.
This YouTube video, from It’s Okay to Be Smart (PBS), explains the difference between the terms fact, theory, hypothesis and law in science.
This YouTube video, from teacher Courtney Mann, has information about creating well-defined, testable questions.
Join Paxi on his journey to the Red Planet to investigate if Martians exist, and learn about the European Space Agency's ExoMars missions. (4:53 min.)
In this European Space Agency's video, follow Paxi on his journey to Mars, where he will explore the planet's dry river beds, volcano, and polar ice caps. (5:06 min.)
Join Paxi on a journey through our Solar System, from the rocky inner planets close to the Sun, past the giant planets to the freezing edge, the home of comets. (5:18 min.)
Astronaut Scott Kelly has posted images of the first ever flower grown in space. (1:05 min.)
Chris Hadfield demonstrates how spinach is rehydrated in preparation for a meal on the ISS. (1:20 min.)
Canadian astronaut Bob Thirsk and Belgian astronaut Frank De Winne discuss the different types of foods available on the ISS during their 2009 mission. (5:07 min.)
In this video Paul Andersen explains how matter moves from the environment into living organisms and back into the environment. Food webs are used to show how matter and energy move through organisms. Ecological pyramids show that matter and energy are lost as they move from producers to consumers.
A song about photosynthesis. (1:58 min.)
High Definition time lapse of three tomato plants sprouting and growing. The days listed in the bottom left corner of the screen are days since planting. The text in the bottom right indicates when the plants were watered. (1:13 min.)
Simple explanations of flower parts, pollination, and double fertilization in angiosperms. (8:04 min.)
Is the weather on Mars anything like the weather on Earth? NOVA asked Vicky Hipkin from the Canadian Space Agency, who was part of the recent Phoenix Mission to explore conditions on the Red Planet.
Recently, astronauts were able to grow and eat lettuce in space! How was this possible?