Happy Father's Day! Here are five unexpected research findings about dads.

Fathers make it possible for mammal moms to raise particularly large-brained offspring, research finds. Other helpers just won't do.

A few subtle cues in the OB-GYN waiting room could get fathers more involved in prenatal care.

Giving fathers the education and support they need to talk to their sons about condom use could be a key way to reduce STIs.

Dads with daughters are more likely to support female candidates and policies that support women, but the birth order of their kids may change that.