I'm a retired IT professional with interest in Science. When I was at school, I always challenged the facts I was taught e.g. I disagreed with the inverse square law in that you can't get an infinity force. I proved that with two weak magnets by putting a south pole to another south pole and told my colleagues that, according to the inverse square law, it's impossible to make these poles touch. I then proceeded to make them touch thus disproving the law. From that time on, I never believed in infinities although I keep an open mind on the universe being infinite.
I also challenge the theories of relativity particularly the special theory because Einstein used length contraction and time dilation to compensate for the errors introduced by holding the speed of light constant. I also have an alternative of the Big Bang, which is what my first book - The One Force of Nature - is about, but after the energy was created. No one can explain the creation of the first energy without violating the conservation laws. So, Lawrence Krauss is wrong about his "universe from nothing". They merely classify that as philosophy so that they don't have to explain them.