People give in at the first fence in intelligent design. They say this can't ever have evolved under the pressures of natural selection. What they really mean is that we're too stupid or too lazy to think of how it might have come about. There is nothing in the biosphere that in principle cannot be understood in terms of evolution. But science is hard work, and scientists really have to struggle. Scientists aren't sliding down hills on toboggans they're actually climbing mountain peeks. And while all these intelligent designers are tobogganing down because it's a nice easy way of going places, we scientists are really struggling to reach true understanding.