 Prof. Himindra Arya comes from the Aero department. So he said, Prof. Chakravati, we use these small, you know, fuel pumps, which have this mechanism where it takes fuel from small tanks and fills into small aircrafts which are flown. Then we said, why can't we use that pump in our water bottle? So we immediately went online, we purchased this pump, fitted to a rig. See, the rig is very critical. This is a working rig. There's a bottle of dirty water. There is a pump, which is what we are using. And then we have the filter, which is giving us all the filtration. Do you think I can go and give this to the CRPF Javans? No. So why can't I give this to the CRPF Javans? It's not noisy. It is very good. It's noisy. What else? Quickly, loudly. It's noisy, so it won't work. Not user-friendly. Next. Not robust. Not robust enough. All too many loose parts. Very good. No robust storage. No proper storage, just getting into the water. What else? Quick. Still don't know whether the water's safe or not. Good, but she's got a point here. How will the end user know that the water is clean and good? How will I develop that confidence in the end user of the water's clean? That's a design question, which we have to solve by the look and feel of a bottle, make it look clean. It should feel that you're getting pure water. So that's a feeling, which we need to design and aesthetics and product form and all that. We'll have to generate that feeling, because they do believe in the product. And what is believing in the product is about what you do with its external form, how you package it, how you give it to them. All those will matter. That's a very good answer too. Any other points? It's inconvenient to carry. Inconvenient to carry. Very good. That's the most serious problem. How will you carry these so many loose parts? We checked on the rig, but why is the rig very important? You know the principle works, now you have to make it... Perfect. You know the principle works. You also experience as a designer how the principle is working. You have first-hand experience of cranking, of the tube coming out. You push the tube back again. Then you say, oh my, this connection is very critical for my end product. Because if the tube comes out because of the pressure, then there will be a serious problem. So you get to know a lot and this is what we call design thinking. You go ahead and work and create multiple rigs and check how things work. So then what happened is we went ahead with our process of design and as a rule, we kept on engaging with all the CRP of Javan constantly. And here I like to again draw another insight which they gave us. They said this bottle should be so robust that when we are on our operations, we jump down. If the bottle comes and hits a stone, the side they may have stone, multiple things, the bottle should not break because water is life for them. So you can see here that the CRP of personnel came to our office and you can see them in a line. The first one had five years experience in the field. The second one had 10 years experience in the field. The third one had 15 years experience in the field and different, different sectors. And the type of lesson they gave me, I can't forget.