pin pricks in a sentence

1. All infants demonstrated the "complete" response after six or fewer pin pricks.

2. While astronomers have observed some galaxies at this distance, they have only appeared as tiny red pin pricks.

3. In 1974, in ignorance of the experiments already performed Rich tested 124 full-term babies to determine the "normal response" to a succession of pin pricks around the knee.

4. Although the United States military "doesn't do pin pricks", we still carry the burden to punish regimes that would flout long-held conventions banning the use of biological, chemical and nuclear weapons.