Bing Video: Gray Whales Battle Orcas During Migration (http://www.bing.com/videos/watch/video/gray-whales-battle-orcas-during-migration/264xqte4?from=email)

What is silverlight that is needed to view. Why would I want it? Too bad , i was curios about the sharks vs Killer whales but I've been burned a lot lately by malware , etc so I'm being cautious .