Clarify why a diagram of evolution looks more like a bush than a straight line.

different horse species could be alive at the same time as others. they all descended from a common ancestor.

liquid crystals are matters in a state which have properties between those of conventional liquids and those of solid crystals[1]. liquid crystal is partially ordered and anisotropic. in terms of molecular order, liquid crystal molecules have one-dimensional or two-dimensional long - range order.

life would be meaningless without memes