Countries are powered by a diverse range of energy sources, but in Australia electricity generation mainly has one source: fossil fuels. Coal, natural gas, and oil account for over 90% of the country s electricity. Hydro provides 7% with only 0.3% provided by wind and solar. Should Australia consider nuclear power? It is a complicated issue leaving many uncertain about its place in Australia s energy future.

What is radiation? Are all types harmful? What are the most common sources of damaging radiation? Most people view radiation as harmful and negative without understanding what makes it potentially damaging and which forms should be avoided. For example, many felt radiation from mobile phones probably caused cancer but few focused on the carcinogenic effects of UV rays.

Many videos on YouTube show water freezing almost instantaneously. This video shows you how to replicate the experiment and it explains how the phenomenon works. Molecular illustrations are courtesy of: PhET Interactive Simulations University of Colorado http://phet.colorado.edu.

My PhD: https://ve42.co/phd It is a common view that "if only someone could break this down and explain it clearly enough, more students would understand." Khan Academy is a great example of this approach with its clear, concise videos on science. However it is debatable whether they really work. Research has shown that these types of videos may be positively received by students. They feel like they are learning and become more confident in their answers, but tests reveal they haven t learned anything. The apparent reason for the discrepancy is misconceptions. Students have existing ideas about scientific phenomena before viewing a video. If the video presents scientific concepts in a clear, well illustrated way, students believe they are learning but they do not engage with the media on a deep enough level to realize that what was is presented differs from their prior knowledge. There is hope, however. Presenting students common misconceptions in a video alongside the scientific concepts has been shown to increase learning by increasing the amount of mental effort students expend while watching it.

More info about travel to Tallinn: https://www.ricksteves.com/europe/estonia/tallinn Tallinn has modernized at an astounding rate since the fall of the Soviet Union, while also remaining one of the best-preserved medieval cities in the north of Europe. #ricksteves #ricksteveseurope #tallinn Visit http://www.ricksteves.com for more information about this destination and other destinations in Europe. Check out more Rick Steves’ Europe travel resources: “Rick Steves’ Europe” public television series: https://www.ricksteves.com/watch-read-listen/video/tv-show “Travel with Rick Steves” public radio program: https://www.ricksteves.com/watch-read-listen/audio/radio European Tours: https://www.ricksteves.com/tours Guidebooks: https://store.ricksteves.com/shop/guidebooks Travel Gear: https://store.ricksteves.com/shop/ Trip Consulting: https://www.ricksteves.com/travel-help/plan-your-trip-with-our-expert-consultants Travel Classes: https://www.ricksteves.com/watch-read-listen/video/travel-talks Rick Steves Audio Europe App: https://www.ricksteves.com/watch-read-listen/audio/audio-europe Rick Steves, America s most respected authority on European travel, writes European travel guidebooks, and hosts travel shows on public television and public radio.

A short a cappella tribute to experimentalists. It is sung while performing three simple experiments with household items: Mentos dropped in diet Coke, a tea bag emptied and burned, and a ping pong ball floating in the air stream of a hair dryer.

Help support videos like this: https://www.patreon.com/cgpgrey **CGPGrey T-Shirts for sale!**: http://www.cgpgrey.com/t-shirt Watch the full series of Politics in the Animal Kingdom here: http://www.cgpgrey.com/politics-in-the-animal-kingdom/ If you would like to help me make more videos please join the discussion on: Google+: http://plus.google.com/115415241633901418932/posts Twitter: http://twitter.com/#!/cgpgrey Facebook: http://www.facebook.com/pages/Greys-Blog/193301110697381 Or suggest ideas and vote on other peoples ideas on my channel: http://www.youtube.com/user/CGPGrey

If you ve seen footage from the International Space Station or any of the space shuttle missions, you know that astronauts float around as they orbit the Earth. Why is that? Is it because the gravitational force on them is zero in space? (Or nearly zero?) The truth is that the strength of the gravitational attraction is only slightly less than it is on Earth s surface. So how are they able to float? Well, they aren t floating - they re falling, along with the space station. They don t crash into the Earth because they have a huge orbital velocity. So as they accelerate towards the Earth, the Earth curves away beneath them and they never get any closer. Since the astronauts have the same acceleration as the space station, they feel weightless. It s like being in a free-falling elevator (without the disastrous landing). Director of Photography: Stefan Smith Camera Assistant: Raa Perajeev Boom Operator: Maha Sivalingam Production Coordinator: Adrian Tan Production Assistants: James Peniata, Pratheep Ramachandran

If you drop a heavy object and a light object simultaneously, which one will reach the ground first? A lot of people will say the heavy object, but what about those who know both will land at the same time? What do they think? Some believe both objects have the same gravitational pull on them and/or both fall to the ground with the same constant speed. Neither of these things is true, however. The force is greater on the heavy object and both objects accelerate at the same rate as they approach the earth, i.e. they both speed up but at the same rate.

CLICK TO POST TO FACEBOOK NOW http://on.fb.me/DeerWrestle A couple of my friends go out of their way to save a deer. Frame 1: Deer is stuck as he had been for 2 days. Notice he s near water but can t drink. Frame 2: Putting tags in the deer s ears so hunters won t kill it and it can be tracked Frame 3: Deer is ticked. Frame 4: Trying to cut his antler free Frame 5: Deer tries to gore my friend, he holds strong and deer breaks of his own antler. This isn t a big deal... natural shedding was 2 weeks away. Frame 6: Deer is freed Frame 7: Deer lays down Frame 8: Friend retrieves Antler Frame 9: Please Subscribe ~~~~~~~~~~~~~~~~~~~~~~~~~~~~ GET SMARTER SECTION:

A basketball and a 5kg medicine ball are dropped simultaneously. Which one hits the ground first? It seems obvious that the heavy one should accelerate at a greater rate and therefore land first because the force pulling it down is greater. But this is forgetting inertia - the tendency of mass to resist changes in motion. Therefore, although the force on the medicine ball is greater, it takes this larger force to accelerate the ball at the same rate as the basketball.

Newton s Law of Universal Gravitation can be summarized as "all mass attracts all other mass." But if this is true, why don t we notice the gravitational force of attraction between everyday objects? The reason is because the gravitational force is quite weak.

Sign up for the DESIGN SESSIONS here: https://bit.ly/3fAGlT6 Visit the Kinwoven Website: https://bit.ly/kinwoven || Do ALL the Subscribing || Subscribe to This Channel: http://bit.ly/1HQxHwB Subscribe to Sharrah s Channel: http://bit.ly/2ksIyIV Follow Rebecca on Instagram: http://bit.ly/2prycLJ Follow Sharrah on Instagram: http://bit.ly/2NyAMJD Follow Kinwoven on Instagram: https://bit.ly/2SP9Cjg Dorm Room Decorating, Room Tour, Dorm room, How to decorate your college dorm room, Cool Dorm Rooms, Dorm room decorating and organization ideas take a tour of Sharrah s room, her Dorm room decorated by her Interior Designer mom. Rebecca Robeson, creator of Makeover Mondays. By San Diego Interior Designer Rebecca Robeson http://www.youtube.com/watch?v=_b9TYyYnzFU Behind the scenes Trade Secrets. Interior Designer Rebecca Robeson designs a fabulous bedroom/Dorm room makeover for her college age daughter Sharrah. Watch the project unfold as Rebecca takes you behind the scenes of this "one of a kind" YouTube Interior Design Video where reveals all of the steps along the way to create a custom bedroom design just for YOU! Dorm Room Decorating, Storage ideas for Dorm rooms, College Dorm Room ideas, My Dorm Room, My College Dorm Room, Dorm Room decorating on a Budget, Ikea for Dorm Rooms, Ikea Bedroom, Budget Bedroom decorating ideas. Links to Related videos: Dorm room on a Budget fail http://www.youtube.com/watch?v=rdnmoJS5LIg Sharrahs bedroom home http://www.youtube.com/watch?v=9_3FbsF9vOs Interior Design Trade Secrets... behind the magic!! http://www.youtube.com/watch?v=_b9TYyYnzFU How to make shower curtain http://www.youtube.com/watch?v=lWq992bvFvc Music: Party Club by Josquin des Pres

Click to tweet! http://bit.ly/QDMA_Deer_Save Antler is broken off in the process, but he ll be just fine! These are some buddies of mine who are very active deer hunters and conservationists. They actively try to manage the deer population in our local area. Pennywhistle Productions ~~~~~~~~~~~~~~~~~~~~~~~~~~~~ GET SMARTER SECTION:

There is a gravitational force of attraction between the Earth and the moon, but is it mutual? That is, are the forces on the Earth and the moon equal? Most people would say no, the Earth exerts a greater force of attraction because it is larger and has more mass. This is a situation in which Newton s Third Law is relevant. Newton s Third Law says that for every force, there is an equal and opposite reaction force. So the force the Earth exerts on the moon must be exactly equal and opposite the force the moon exerts on the Earth. But how can that be - that the same size force keeps the moon orbiting, but barely affects the Earth? The answer is inertia - the tendency for all objects with mass to maintain their state of motion. Since the Earth has much more mass than the moon, it has greater inertia and therefore experiences much less acceleration for the same amount of force.

People have a lot of different ideas about what gravity is: a downward force that stops you from flying off into space, an attraction smaller objects experience towards larger objects, or a mutual attraction between all masses. It is the last of these ideas that best reflects a scientific conception of gravity.

Please help me understand what is going on here. Like I mention in the video, the temperature was ABOVE freezing and snow was melting. This water was running from a spring type source and falling into a pool. It s not the Leidenfrost effect, but it looks just like it. ~~~~~~~~~~~~~~~~~~~~~~~~~ From WBeaty: Here s an article ref about the droplets: C.L. Stong, "Curious Bubbles in Which a Gas Encloses a Liquid Instead of the Other Way Around", Scientific American Magazine, THE AMATEUR SCIENTIST, April 1974 The key to the effect is EXTREMELY CLEAN WATER. Usually we don t see the droplets, since any microscopic crap on the water surface will let the droplets "pop" and merge into the water surface. With clean water, they last a couple of seconds. With extremely clean water they ll last far longer. Also see: http://amasci.com/amateur/antibub/antibub1.html http://www.antibubble.org/page2.shtml ~~~~~~~~~~~~~~~~~~

It takes the moon about 27 days to orbit the Earth. What makes it go round? It is the gravitational attraction of the Earth on the moon. Due to the moon s velocity, the Earth keeps pulling the moon towards it without the moon actually getting closer to the Earth. This is similar to how satellites orbit the Earth.

What forces (i.e. pushes or pulls) are acting on you right now? Most people can identify the gravitational force down, but there must be something else otherwise you would accelerate down towards the center of the Earth. The other main force on you is called the normal force. It is a force perpendicular to the surface that supports you, like the ground or the seat of your chair. You compress this surface and it acts like a spring, pushing you up.

Force is a central concept in physics. By analysing the forces on an object, its resulting motion can be determined. But what exactly is a force? The word force is used in everyday language in a variety of contexts, only some of which reflect the scientific definition of force. In this video, people at Victoria Park in Sydney are interviewed on their ideas of force and the forces that act on them.