2.5% of Jiu Jitsu

In The 4-Hour Body: An Uncommon Guide to Rapid Fat-Loss, Incredible Sex, and Becoming Superhuman author Timothy Ferriss says, To  be  perceived  as  fluent  in  conversational  Spanish, for  example, you  need an active vocabulary of approximately 2,500 high-frequency words. This will allow you to comprehend more than 95% of all conversation. To get to 98% comprehension […]