Announced today, Amazon's Alexa will be using Wolfram|Alpha to answer users questions.
Impress your friends, settle family disputes over the holidays, show off your ability to ask interesting questions...
is this a skill that needs to be enabled?
Nope! Just ask Alexa a computation-related query and it will likely route to Wolfram|Alpha for an answer (not all queries will be routed immediately, as there's a learning curve on Alexa's side for understanding what source should be used for each query).