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Discover the hormones that dictate whether a plant grows downwards with gravity, towards water and nutrients, or upwards towards light.
For more films like this visit www.twig-world.com

Discover the hormones that dictate whether a plant grows downwards with gravity, towards water and nutrients, or upwards towards light.
For more films like this visit www.twig-world.com

Photosynthesis was written and created to help students learn and remember the process we all love and call, "Photosynthesis!". Visit www.learningscienceisfun.com for more videos, curriculum and fun science stuff.

Hank explains the extremely complex series of reactions whereby plants feed themselves on sunlight, carbon dioxide and water, and also create some by products we're pretty fond of as well.

SciShow takes you down the deepest hole in the world -- Russia's Kola Superdeep Borehole -- explaining who dug it and why, and what we learned about Earth in the process. Don't fall!

However, a little known fact about this flight is what took place before it. Shepard sat in the rocket for five hours because of delays, and the astronaut really had to use the restroom.

Maddie reveals just how much we depend on bees, and how close we are to facing that reality!

A nice, thorough introduction to minerals.

The video introduces mineral properties using common fruit and vegetables as analogies for these five descriptive criteria. The video also demonstrates the orderly crystalline structure of halite (NaCl) using a model made of food (marshmallows and grapes). Comparisons between common substances such as ice and glass versus the mineral definition are made to illustrate the specific nature of the mineral definition.

We bet you thought that rocks are just rocks, but the truth is there are three different kinds of rocks. Learn the differences between sedimentary, metamorphic and igneous rocks.

According to the study: "For five metals (arsenic, cadmium, lead, manganese and zinc), strong correlations of concentrations in uncultivated soils indicate a common source, suggesting that emissions from the complex may be a major contributor to elevated concentrations of these five metals in uncultivated soils in this area.

The future of manned spaceflight is coming into focus. Whether it's through NASA's Orion program, its partnerships with private companies or in the form of the quick, space-immersion experiences that Virgin Galatic's SpaceshipTwo spaceships are soon to offer.

Billionaire Richard Branson recently placed a full-scale replica of his spaceship on the deck of the Intrepid Air and Space Museum in New York City. You can see it for yourself in the gallery above and Vine video below.

The map above shows the past century of known earthquakes with a magnitude of at least 5. (There are actually nearly a million earthquakes per year, but most of them are not felt. A earthquake of magnitude 5 might cause damage to buildings.) Each white dot is a quake, of which there were about 72,000, and as you'd expect, you get a sense of plates tectonic boundaries.

The distance from the surface of the Earth to its center is 3,959 miles. The thickness of the ocean lithosphere or the relatively solid skin of the earth under oceans is only 41 miles, which in relative terms is much thinner than the skin of an apple.

When a 7.1 earthquake explodes with the force of 2,000 kilotons of TNT across San Francisco, citizens become heroes to save lives.

If you look through your glasses, binoculars or a window, you see the world on the other side. How is it that something so solid can be so invisible? Mark Miodownik melts the scientific secret behind amorphous solids.

A father of four, who applied for a one-way-ticket to live on Mars, could be looking at a divorce as a result of his extraterrestrial ambition.

Ken Sullivan made it the next stage of the Mars One project, which could potentially see him making a new life on Mars - but his wife and children are not happy about the news.

Mr Sullivan, who lives in Utah, is among the 1,058 applicants selected so far who could colonise the red planet and never return to their families and friends on Earth.

A scientist takes a big risk to get a lava sample from the rim of a lava lake.