[Applause] five fun physics phenomena number one have a friend hold a cane out horizontally for you or another similar object and putting your two index fingers together try to place them underneath the center of mass when they let go you will find it doesn't normally work but now try putting each index finger at opposite ends of the cane and then moving your index fingers in towards the middle what you will find is that they always end up right under the center of mass of the cane you can try starting off asymmetrically and they will still end up under the center of mass you can try going at different speeds really slowly or really fast but you still end up perfect ly under the center of mass how does this work number two the phone flip have you ever tried to spin your phone if you do it in this direction it's pretty easy it stays nicely aligned if you spin it along its short axis you'll also find it spins very well but if you try to flip your phone end overend like this you can't do it cleanly the phone will never flip simply end overend without also rotating in one of the other directions even when I make an almost perfect flip instabilities grow until the phone rotates around another [Music] axis why can't no I still can't do it why is it so number three you've probably seen that if you rub a cup on your hair you can make it electrically charged and if you bring it close to a stream of water you can actually cause that stream to Def deflect now usually this is used in chemistry textbooks as a demonstration of the Polar nature of water water is a molecule with a more positive side and a more negative side and so what happens so you're told is that the water molecule flips around so the positive side of the water faces the negative side of the cup and that is what attracts the water to the cup but this is not the real explanation if you have a uniform electric field there is an equal force pulling the positive side towards it as there is is pushing the negative side away from it and so you can't actually do more than just turn the molecules you would need a really really strong gradient in your electric field to make this work at all and it basically is just not going to happen from a cup so why is the stream actually attracted to a Charged cup that is the question number four take a piece of your favorite cereal and drop it into a bowl of water then using a very strong magnet try to pull the cereal around Isn't that cool so why is cereal magnetic and finally five the teabag rocket take a tea bag and cut off the sealed end very carefully now dump out the [Music] tea form the tea bag into a sare square column and balance it on the plate now light the top of the tea bag on fire try to light it evenly on all sides get ready for takeoff in three two one H yeah that is the beauty of the teabag rocket so why did that happen so how do all of these phenomena work let me know in the comments or make a video explaining any or all of them or subscribe to the channel and I'll post the answers next [Music] week I hope you enjoyed those fun physics phenomena I know a guy who would the former commander of the International Space Station Commander Chris Hatfield I'm actually hosting Live Events with him in late August in Sydney and canra I am so looking forward to that now the Sydney shows are all sold out but there are still as of now tickets to the Cambra show so if you want to come to that check out the link in the description now Chris haffield actually wrote a book called an astronaut's Guide to Life on Earth and I am listening to it right now as I travel around the world and it is awesome because it contains great advice not only for people who want to become astronauts but also for everyone who wants to lead a meaningful life here on Earth and you can download this book for free if you like by going to audible.com/veritasium or you can pick any other book of you're choosing for a one-month free trial audible is a great service with over 150,000 titles in all areas of literature including fiction non-fiction and periodicals and so you can find virtually anything you want there and by going to audible.com/veritasium they know that I sent you and they help me out to continue making these videos for you for free so I really want to thank Audible for supporting me and I want to thank you for watching