1.   As the shunt carries fluids from the liver to the veins, a tiny valve, about an inch long, prevents blood from flowing in the opposite direction.

2.   At seven weeks of pregnancy, the fetus is about an inch long.

3.   Christopher, who had gone on ahead, spotted a small, triangular piece of bone, only about an inch long.

4.   Each about an inch long.

5.   Engineers at the Massachusetts Institute of Technology have developed a conventional jet engine that is less than one-half inch long.

6.   Fossil fish teeth, like this one greatly magnified, are actually about one-fortieth of an inch long.

7.   From inside sponges, scientists lured two types of never-seen-before goby, one yellow- striped, the other less than an inch long.

8.   From inside sponges, scientists lured two types of never-seen-before goby, one yellow-striped, the other less than an inch long.

9.   Hairline cracks as small as an eighth of an inch long can be spotted.

10.   He has held the minuscule frogs in his hand, barely feeling the weight, for the biggest are just over an inch long.