1.   He could hear the fear in their voices and understood its origin.

2.   To understand the origin of species we need to know what these frontiers are and how they arise.

3.   We simply do not understand the origin of this hugely variable relation between injury and pain.

4.   With these techniques the woman can understand the origin of her problem and May sometimes be able to resolve it.

5.   Without understanding the origins we shall make little progress in trying to comprehend the present, or indeed, any other aspect of the situation.

6.   But to the extent that it is, it would help him understand the origin of his current troubles.

7.   Controversy is not new to paleoanthropology, where explorer egos can be big, the scramble for money never-ending and the prospect of understanding human origins alluring but elusive.

8.   Duncan and Thompson were trying to understand the origin of their magnetic fields, which appear very weak compared with what is possible in forming neutron stars.

9.   Identifying and tracing the products of smart genes could help researchers understand the origins of these abilities, with potentially far-reaching consequences.

10.   Melsby said he does not understand the origin of his illness, nor did he explain the struggle to regain feelings of normalcy.