The central nervous system in the average man weighs about 1480 grams, or just over 3 pounds.

Originally, the silver used was nearly pure, weighing about 4.5 grams.

By the end of this week, your baby weighs about 300 grams and is around 20 centimetres long.

The bird is approximately 34 cm long and weighs about 65 grams.

Its brain showed another small increase in size, and may have weighed about 550 grams.

The 4 "moon rocks" weigh about 0.05 grams in total.

It is 9-10 cm long, and weighs about 3-4 grams.

The infants weigh about 25 grams by the tenth day.

They weigh about 2 grams, depending on the size of the frog.

These devices have no moving parts, and weigh about 50 grams.