This is the number of distinct people that have helped us digitize at least one word out of a book through reCAPTCHA: 750 million, which is a little over 10 percent of the world's population, has helped us digitize human knowledge.
reCAPTCHAを通して本の電子化に 多少なりとも貢献している人の数は ７億５千万人に上ります 世界人口の10%以上が 人類の知識のデジタル化に貢献しているのです