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"http://yt.cl.nr/iQOHRKKNNLQ" In this segment I ask why astronauts in the space station are weightless. The most common answer is because there is no gravity in space. But of course there is gravity in space, especially where the space station is located (only about 400km from Earth's surface). So astronauts still experience a gravitational pull - it's just that they and the space station are in free fall so they are accelerating together towards the Earth. The space station doesn't crash into the Earth because of its orbital velocity - it's going 28,000 km/h so as it falls, the Earth curves away from it.

Connect your classroom to the world Skype is a free and easy way for teachers to open up their classroom. Meet new people, talk to experts, share ideas and create amazing learning experiences with teachers from around the world.

SpiderScribe is an online mind mapping and brainstorming tool. It lets you organize your ideas by connecting notes, files, calendar events, etc. in free-form maps. You can collaborate and share those maps online!

Educational Technology and Mobile Learning has dedicated a whole section to reviewing  educational tools and tips teachers and students can use to maximize their benefit from YouTube.

"http://yt.cl.nr/8V2ncwumv9o" Col. Joseph Kittinger -1960 - set world records for highest parachuting jump (102,800 ft. or 20 miles, 31km), highest balloon jump and fastest speed (close to speed of sound) by a person through the atmosphere.

Fun, interactive, research-based simulations of physical phenomena from the PhET project