1 - History has revealed that terrorists are capable of carrying out bold and destructive acts that at first glance appear to be unexplainable.

2 - Even a brief glance through a small telescope will show us that there are two types of star clusters in the sky.

3 - Although at first glance the chimpanzee and the orangutan may appear similar, a closer study of these two apes shows many important differences.

4 - Some researchers have a theory, as strange as it may seem at first glance, that aliens may have a hand in the rise of human culture.

5 - When astronomers see something in the universe that at first glance seems like one-of-a-kind, it's bound to stir up a lot of excitement and attention.