But in the end one fact alone explains what we see today.

Life, explained by natural selection alone, just does not seem inevitable enough.

Alarmed, some families wondered whether the shots alone explained the change.

In any event, the save-the-loon movement cannot be explained by science alone.

He was in love with risk, and this fact alone explained his passion for foraging.

But the complexity of the decision cannot alone explain such procrastination.

The differences, the researchers wrote, "cannot be explained by individual lifestyle or genetic factors alone."

But the climate cycles are too strong to be explained as the direct effect of the astronomical changes alone.

These are mysteries in the sense that they cannot be explained or apprehended by reason alone.

But the upsurge is too large to be explained by an increase in births alone.