Studies indicate that gay men often exhibit a hyper male pattern in finger length ratios, suggesting biological differences that are not influenced by behavior but rather by hormonal exposure before birth.

There's a specific area in the hypothalamus called the interstitial nucleus of the anterior hypothalamus that differs in size between gay men and straight men, suggesting biological factors in sexual orientation.

Trauma experienced at any age can increase the risk of addiction, but earlier trauma tends to have more lasting effects due to brain development stages.

Identical twins raised apart tend to have similar IQ scores, suggesting that genetic factors play a significant role in intelligence, despite being raised in different environments.

The rise in low testosterone levels among young men is alarming, often linked to obesity and hormonal imbalances caused by diet. It's essential to address these issues through lifestyle changes before considering hormone replacement therapy.

Starting to drink at a younger age significantly increases the risk of developing alcohol dependence, regardless of family history.

Having children can reveal how similar they are to you in personality and knowledge, highlighting that the gap between generations may not be as large as we think.

Trauma is a significant driver of substance use, with studies showing that 40 to 60% of addiction risk is genetic, while the other half is influenced by trauma.

Testosterone levels in male monkeys can be signaled through physical traits, such as the size of their taint, which indicates their reproductive competence and social status.