A massive haul of stone tools discovered in a cave in Mexico provide evidence that people occupied the area more than 30,000 years ago, suggesting that humans arrived in North America at least 15,000 years earlier than had been previously thought. The discovery is backed up by a separate statistical analysis incorporating data from sites in North America and Siberia. ...

Knowing whether to stay in or leave a romantic relationship is often an agonizing experience and that ambivalence can have negative consequences for health and well-being. Now a new study offers insights into what people are deliberating about and what makes the decision so difficult, which could help therapists working with couples and stimulate further research into the decision-making process. ...