We all know dinosaurs laid eggs.
Ostriches and turkeys also lay eggs, but the ones we eat most often
are chicken eggs.
Eggs take about 24 to 26 hours to form inside a hen.
An average hen can lay 250 to 270 eggs per year.
In China, approximately 390 billion eggs are produced a year, while
the US produces about 75 billion eggs a year.
An egg shell is made of calcium carbonate and makes up 9-12 percent
of an egg's total weight. It contains pores that allow oxygen in and
carbon dioxide and moisture out.
The blood sometimes seen in an egg comes from the rupture of small
blood vessels in the yolk. It does not indicate the egg is unsafe to
eat.
An average person on Earth consumes 173 eggs a year (less than one
chicken lays).
The world record for eating hard-boiled eggs is 65 in 6min 40sec, by
Sonya Thomas in 2003. She would have eaten more but they ran out of
eggs.
Here is the big answer to the big question of which came first,
the chicken or the egg. The egg came first, because dinosaurs laid
eggs before chickens evolved.