如果你的身体确实存在危险，比如一头公牛正在向你冲来，这些反应将可以挽救你的生命。但我们的身体也会释放皮质醇以应对情绪压力，在这种情况下，心率加快并没有多大好处，比如查看手机时发现老板发来的一封愤怒的邮件。

Modern life makes us tired, right? But research from societies in Africa and South America suggests people in the ancient ...

Scientists researching Alpine glaciers store ice in Antarctica. By analysing air bubbles in the ice they may be able to predict the future ...