Does marijuana increase sexual desire?

(CNN) – In the movie “Annie Hall,” the titular character likes to smoke a joint at bedtime because, she says, it relaxes her and helps get her in the mood for sex — even though her boyfriend claims… MORE

11,000 years ago, our ancestors survived abrupt climate change

(CNN) – Imagine if, instead of heat this summer, we were faced with a sudden, dramatic cold front that lasted the next 100 years. That is what our hunter-gatherer ancestors lived through 11,000 years… MORE