Hard simple ques­tions facts

Oxygen comes in through pores in the shell. Directly under the shell, there is a small pocket of air. The microscopic pores on the egg surface allow the CO2 to escape and fresh air to get in, so a developing bird can breathe.

In Vinci. Leonardo da Vinci was born on 15 April 1452, in a farmhouse about 3 kilometers from the town of Vinci, near Florence. His full name was "Leonardo di ser Piero da Vinci", which means "Leonardo, son of Piero, of Vinci".

Name of the Karakoram Range. The name K2 is derived from the notation used by the Great Trigonometric Survey. Thomas Montgomerie numbered the most prominent peaks of Kararkoram K1 to K35. Next, these were replaced by local names, but K2 appeared not to have acquired a local name, possibly due to its remoteness.

In January. Earth's perihelion occurs around January 3, and the aphelion around July 4. The distance change is about 3.5%, which gives 6.9% increase in solar energy reaching the Earth at perihelion relative to aphelion. Since the southern hemisphere is tilted toward the perihelion, the southern hemisphere receives more energy from the Sun than does the northern over the course of a year.

Carbon dioxide is produced by bacteria feeding on the lactic acid. In the Middle Ages, the holes were considered a sign of imperfection and cheese makers would try to avoid them.