Greg Dennis Car Reviews on Instagram: "The new Audi A5 sedan has a pretty cool sunroof that uses liquid crystals between the glass layers that react according to an electric current that result in the glass changing its appearance… such a cool idea! Full review from the Audi A5 launch is live on my YouTube channel. Go check it out  #audi #audia5 #sedan #quattro #cars #carreview #carsdaily #gregdennisreviews"