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.
   When a hen first starts to lay even though the rooster has been  doing his job you will find infertile eggs. Then, however, you will  notice most eggs are fertile.  Some roosters do not cover their hens well, or will be less  fertile than others-hatch rates may vary.he s â¦ perm is stored in the cloaca of the hen for up to 10 days and then needs replenishing. If the rooster has died or otherwise left the flock his progeny may go on for a few more days as the hens eggs will still be fertile until the sperm packet is depleted.