Question #1: Li-Fi

On podcast #433 you referenced Li – Fi and stated that line of sight was necessary . On Podcast The Science Show-full program dated 10/18/2013 Mr. Haas explained why line of sight was not necessary. I assume that you in your usual fashion, researched Li-Fi. Could you please send me links to sources that would refute Mr. Haas as to line of sight. I have been listening to your podcasts for many years and find them to be delightful, informative and your cast of ”the usual suspects” amusing and brilliant. I am seventy five years old and have no scientific training but my curiosity for science is insatiable. Thanks to the wonders of Apple and a DryCase® I am able to listen to you while swimming my mile at the YMCA three times a week. If you send me a mailing address and payee, I will send you a small check to support your podcast (and slightly assuage my guilt). I won’t every use pay pal. Keep up the good work Gaylen Rebbe Simi Valley , Calif