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that have been found in the fuel lines. the concern is the cracks could grow and splinter into hazardous chunks of metal. ♪ -they got a bunch of us, like a dozen engineers, to go fly down to kennedy space center to go look at cracks. there was copious amounts of engineering discussion and testing going on. -stop. thank you. -if a main engine were to explode, that would destroy the vehicle, it'd be out of control, we'd lose the vehicle and the crew. it's too dangerous to fly any shuttle until we get a handle on this. it grounded the entire fleet, including columbia. -it was, like, delayed and delayed and delayed. [ breathes deeply ] you're kind of glad that they're dealing with whatever the issue is, and you're hoping that everything's okay. and, you know, it makes it a little bit more nerve-wracking. ♪ -nasa management and engineering came up with solutions.
or even by gestures, facial movements or speech... page down. ..giving a raft of potential new input methods to disabled people. crucially, motioninput doesn't need any additional specialised equipment. our work with the motioninput software was developed in partnership with intel, and it's focused on al for your pc, so it runs completely on your own laptops and pcs. it has its own engine internally to do the evaluation of how people can be seen to be moving, and it uses just the webcam. the ucl students have been working with the richard cloudesley pupils to help identify potential bugs or development issues with the software. you ready? so do the calibration again. safiya is using the eye gaze application to play different types
this is the challenge faced by zeroavia, one of several companies working to make hydrogen—powered flight a reality. they retrofit existing planes with hydrogen engines. the company had several successful test flights with this plane last year. in the original frame, we would be able to fly about 19 passengers. it looks like a lot of kit in there. how would you fit in 19 people? yeah, so in the retrofitted configuration, it will be about a dozen people. daniela is one of the engineers working on the engine. actually, — the fuel cells are this one. the power is created in these small layers. so you have to build up your layers to create the power to take off an aircraft. this engine could almost provide enough power to get you from london to glasgow, but not quite. if you wanted to scale it up for international flights, would you just make the same thing bigger or is it a totally
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system that will allow to have a lot of power, but minimal weight to be integrated on an aircraft is really a challenge. and that probably means completely redesigning the plane. everything will be shrunk. some parts of the engine, of the fuel cell, will be sitting inside of the nacelle, and also the storage tank, which is, uh, going to be probably the largest, uh, you know, piece of equipment they will actually bring outside, 0k? right. so either on the side of the fuselage, or we will hang it on the wing. making everything fit isn't the only challenge, though. you need to have the maintenance and repair organisation. the whole process needs to be certified. we need to provide the hydrogen infrastructure to the, uh, to the aircraft. zeroavia has a plan for that. in its vision, hydrogen would be produced on site at airports using renewable energy before being processed and transported out to the plane.
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they retrofit existing planes with hydrogen engines. the company had several successful test flights with this plane last year. in the original frame, we would be able to fly about 19 passengers. it looks like a lot of kit in there. how would you fit in 19 people? yeah, so in the retrofitted configuration, it will be about a dozen people. daniela is one of the engineers working on the engine. actually, the fuel cells are this one. the power is created in these small layers. so you have to build up your layers to create the power to take off an aircraft. this engine could almost provide enough power to get you from london to glasgow, but not quite. if you wanted to scale it up for international flights, would you just make the same thing bigger or is it a totally different exercise? it is scalable until a certain power, but then we'll have to change technology. getting this high—power density
and all five members of the spice girls reunite in london to celebrate the 50th birthday of band member, victoria beckham. hello and welcome to bbc news. i'm lukwesa burak. us officials say the next delivery of american military aid for ukraine could arrive within a week. after a delay of six months, the house of representatives finally approved the multi—billion dollar package last night. america already provides the bulk of international support for kyiv, having spent more than $74 billion in the first two years of the war. the new package is worth $61 billion dollars, including money to replenish stocks of us armaments, and $14 billion will pay for advanced weapons