The article mentions hidden dimensions and other universes in the same sentence. This is a pet peeve of mine. In Multi-dimensional quantum mechanics the dimensions are additional directions. They are not other universes and the combination of the two in one sentence is either intentinally muddying the water, or the person writing the article is not familiar with the mathematics involved and should not be taken seriously. The standard Cartesian coordinate system used to describe our universe in it's basic sense contains x.y, and z, directions, a set of values that many of the programmers on Slashdot are familiar with. Multi-dimensional physics just adds more of these in an attempt to explain the very real observable quantum effects that Newtonian physics and relativity cannot explain and never will. We currently know more about the Andromeda galaxy than the Milky Way because it is difficult to describe an object when you are inside it. Getting a third person look at the universe, even if it is just a mathematical trick, is probably the easiest way to describe it. The refusal to do so is probably not going to go very far. What the emergence of time means is also not what they are describing it to be and should not be looked upon as a valid argument. In a holographic quantum view of the universe it could be considered similar to a wave propagating through a substrate, but also be akin to a temporary chemical reaction wave, where the structure of the substrate is momentarily changed while the wave propagates through. This temporary excitation of the substrate generates the universe we live in. The movement of the universe's propagation is in the direction of time. My take on the hidden dimensions is that instead of viewing them as hidden, we should look at them as directions in which the particles we are made of have a zero width. The reason we cannot travel in time is not because the directions don't exist, it's because the particles we are made of have a zero width in that direction. We would have to be made of something else, and when we went backwards in time we would effect leave our current universe. Other particles, such as the elemental particle of gravity have a non-zero width in one of these direction. What we should really be talking about is the fact that relativity CANNOT describe the orbital trajectories of any stars accurately. The lack of a theory to accurately explain a basic observable fact is more problematic than the inability of technology to currently test the most advanced physics problems. Once our ability to manipulate quantum effects (such as the creation of a working quantum super computer - looking at you google) and we can create technology that is based on quantum mechanics then maybe we will be able to test the theories. Second failure of current theory that I don't think is spoken of enough is the failure of the planck observatory to detect the effects of gravitational waves on the cosmic microwave background. There were several stories about the waves being detected but second looks at the data supporting this cast serious doubt. Since we have now confirmed the existence of gravitational waves and their effects have not been observed as inflation predicts, then the current theory of the big bang they reference at the beginning of the article (we can describe the universe up to a bit before it's creation) is in fact not supported by current experiments and should be rethought. Instead of taking a step back from quantum mechanics we need to take a second look at the non quantum component of physics as it is currently not supported by current data.