 We said now we waited to manufacturing if you go for manufacturing of polycarbon polycarbon is very expensive. So, we tried can we use fluted boards because you know these boards are used for shelters have you seen this it is used in bus stops this up dual walled polycarbonate sheets which are there. So, we took the sheets and we made one quick model and we found that it is not working. Here we realized that the efficiency model is so narrow for us that any experimentation is taking us back to the drawing board. The transitivity in this is reduced by 20 percent and even 20 percent reduction in transparency is not allowing us to go forward. So, that is a very big lesson for us. So, this you know picture shows you how we texted it and we did not work and our temperatures are as low as 60 degrees 60 is just warm water not in boiling water. Then Abhinash called for a brainstorming session they are engineers there, researchers there, there are designers not working on the product will join in and when you have this group discussion there are some interesting ideas which can come up during your you know brainstorming session itself. You start even worrying about how will you transport it, how will you fix it in people's houses, how will they receive the product, where will they buy it from, who will manufacture it, what materials you use, will it be economical or not. So, you take care of all the aspects in your brainstorming session and map all of them together. Look at the type of options rigs we made for various trials, then we also had this doubt will a smaller volume be better, smaller box the better is the conduction and heat evaluation. Then came the breakthrough we went to Prasak Kedare, Kedare is our head of the department of energy science. But here we did a mistake we went very late and Prasak Kedare gave us some wonderful insights of what happens and we cleared all our doubts but he gave us full idea behind science behind the thermal conduction, the value proposition of each material in the product we are using, how conduction happens between the hot plate inside the oven to the utensil having the rise. So, we did all the studies and we also did thermal analysis using softwares to check out in different conditions in the country. You can create different environments, you can create different temperatures, we did all that and we actually came up with the parameters of the material thickness which is very critical. We looked at the cooking temperature by constant measurement and the volume to surface ratio was also very critical. In comparison you should understand that you are talking about cooking right. So, we checked about temperatures for various food requirements and then here I had a very interesting encounter with a businessman in Surat. So, I asked this person, what do you think, he said do not sell as a solar oven, sell it as a rice cooker, see it is such a good insight, if you sell as a rice cooker everybody will buy and nobody will complain saying the dal is not cooking, if it is so smart you are using a solar oven so you just call it a rice cooker and then by the rice is cooking you can do other cooking in a regular gas stove and you are still saving huge amount of fuel and in three years you get the cost of your solar oven back, look at these calculations I never thought about all this, he said I am going to sell it and tell them in three years they are going to get the cost back and they are going to get good health because slow cooking is very good for health and it is tasty food, so multiple levels start coming in, so that is the realization which happened then we went back to the drawing board, we checked out what is happening in various you know aspects of locations and workability, we checked out the temperatures ranging in different locations, we looked at the thermal simulation results, we got some very good simulations done and in the simulation we actually you know got very good temperatures of around you know 98 to 108 degrees then we went theoretical studies, follow whatever temperatures we are getting in Bombay, what are the temperatures we are getting elsewhere and we then know in 90 degrees you can cook rice.