Search service Wolfram Alpha has been in the news this week thanks to tomorrow's launch of Wolfram Alpha Pro, and hidden in a New York Times profile are some details about Siri's impact on the service. Queries originating from the iPhone 4S "digital assistant" now make up about 25 percent of all Wolfram Alpha searches, just under four months since the phone's launch. It looks like Apple currently makes up a pretty significant part of Wolfram Alpha's business, and while it looks like the service is certainly going to get more attention this year with the launch of Pro, we're also expecting to see Apple make Siri a major part of future products going forward. This 25 percent number will likely fluctuate, but we'll likely see Siri continue to be a big contributor to Wolfram Alpha's growth.