Professor Arnold interview summary

I called Professor arnold the other day and here is the summary.
Other dimensions, yes. But they would be so tiny that we would only perceive them as 3d
Big bang. In a Really hot dense state. Then explosion! and it is at 4 quadrillion degrees Celsius.
Other universes like balloons coming toward each other they can touch but cant get inside of each other due to the latex outside. So it will press against the other one but we would have no idea.