Research at DePauw University in Greencastle, Indiana finds that the way people smile in photos in early life can reveal whether their adult relationships are likely to last.

• 位于印第安纳洲格林赛的迪堡大学研究发现，人们在早年时候照片上的笑容，能够显现他们在成人后恋爱关系是否持久。