Smart windows can let visible light through while blocking out heat

Now this is a technology I can totally get behind! I absolutely LOVE having curtains open to let in the natural light, but when it is +35 C outside it makes your home feel like an oven if the sun is pouring in! Plus when it is -40 C in the winter opening the curtains lets out all the heat. If this can actually keep heat out in summer and let the heat through in the winter...where do I sign up!?

This is amazing. That and the fact that you could potentially make it in your home makes it even more appealing. Our home always feels so dark with the lighting we have compared to the natural light, but these allow us to have more without breaking the bank.