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.
A rooster only needs to breed the hen one time for her to be able to lay fertile eggs for 2 or 3 weeks.   Also   The passage of the sperm up the oviduct is rather slow s â¦ o it may be a few days after the first encounter before the egg is viable. chicken need a rooster to fertilize it's sex cell whatever it is   A chicken can lay an egg without a rooster but the egg can never be hatched. If the egg is fertilized t â¦ hen the egg is able to hatch. 2 people found this useful.