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The BBC’s Bang Goes the Theory used a giant gas-powered vortex cannon, which when fired created doughnut-shaped air vortices.

The cannon is not shooting a ring of smoke. The propelled air causes a pressure drop so sudden that air’s water content rapidly condensed into a ball of water. The ring you see is water vapor.

The vortices traveled at about 200mph and brought down a straw house, a wood house, and a wall of bricks (no mortar, so not quite a house).

Source and info here.

What’s Happening Scientifically?

The air envelopes the ball of water, forcing the impacted surface to peel back. As the water’s surface rolls over itself, the air eventually punches through the ball, sandwiching the water between two cones.

The water begins rolling around the inner cone, kind of like if you carefully rolled the cuff of your sock down so that it creates thick, single-looped donut around your ankle. The outer cone drags the water ring along with the speeding air towards the target.

Both layers exude enough force to keep the water ring’s shape intact.

Went to the free Palestine protest in Westminster today. It was such an eye opener to hear how different people of different cultures and religions can collaborate together and let their voices resonate as one to be heard. I heard many people’s stories giving me further insight into what is actually happening in the world. It’s truly inspiring to see how people can be intelligent enough to realise what right from wrong is and how they are willing to stand up for it especially when others cannot.

Conversation with imaginary David Cameron, based on his conference speech

  • David Cameron:

    We need to take bold action to tackle youth unemployment

  • Me:

    I agree. What bold action do you suggest?

  • David Cameron:

    There are still over a million young people not in education, employment, or training.

  • Me:

    Yes. That is very bad. There are no jobs. What are you going to do about it?

  • David Cameron:

    Today it is still possible to leave school, sign on, find a flat, start claiming housing benefit and opt for a life on benefits. It's time for bold action here

  • Me:

    I doubt people would choose that if there were decent jobs available. What would you do to create more jobs?

  • David Cameron:

    I would take bold action!

  • Me:

    What bold action?

  • David Cameron:

    We should give young people a clear, positive choice: Go to school. Go to college. Do an apprenticeship. Get a job.

  • Me:

    How are you going to make sure there are enough apprenticeships and jobs to go around? How are you going to make sure college doesn't lead straight back to unemployment?

  • David Cameron:

    Bold action!

  • Me:

    What bold action? Are you threatening to just cut young people's benefits here? Because if there are no jobs, taking benefits away can literally kill people.

  • David Cameron:

    Bold action!

  • Me:

    You can't just keep saying words with no plan. That's not going to fix anything.

  • David Cameron:

    Bold action!

  • Me:

    If your action is going to be bold why not say what it is?

  • David Cameron:

    BOLD ACTION! BOLD ACTION! ALL HAIL THE BOLD BUT EXTREMELY VAGUE ACTION!

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