If you were to examine the birth certificates of every soccer player in next month's World Cup tournament, you would most likely find a certificate quirk: elite soccer players are more likely to have been born in the earlier months of the year than in the later months. If you then examined the European national youth teams that feed the World Cup and professional ranks, you would find this quirk t
![Freakonomics番外編/子供の未来は「誕生日」で決まる?: ペトロ三木『アタマのおかしいブログ』](https://cdn-ak-scissors.b.st-hatena.com/image/square/91294c5e7d5927632be882106d59f6c861902287/height=288;version=1;width=512/https%3A%2F%2Fblog.ss-blog.jp%2F_common%2Fimg%2Fsonet_logo_l.png)