In this articleÂ­, we will examine solar cells to learn how they convert the sun's energy directly into electricity. In the process, you will learn why we're getting closer to using the sun's energy on a daily basis, and why we still have more research to Â­do before the process becomes cost-effective.n this articleÂ­, we will examine solar cells to learn how they convert the sun's energy directly into electricity. In the process, you will learn why we're getting closer to using the sun's energy on a daily basis, and why we still have more research to Â­do before the process becomes cost-effective.
How long does a hen stay fertile after the rooster is gone?   A hen stays fertile for about 2-2 and a half weeks after the rooster is gone. The sperm stays in her for about that long, sometimes even up to 3 weeks. Started career as professional chef then a district sales manager for a wine & spirits company.
Best Answer: Hens (female chickens) lay eggs regularly. If the hen has not mated with a rooster, the eggs will look exactly the same as a fertilized egg, but they cannot develop chicks and hatch. A typical flock of chickens consists of many hens and one lucky rooster.eport Abuse. The rooster mates with the hen, and then the hen will produce fertile eggs for up to 4 weeks. The egg isn't fertilized after being layed. Chickens have sex, too. Check the following link for more info. Source(s): http://msucares.com/poultry/reproduction...