Sure, you may think you’re an ‹expert multi-tasker,› but changing tasks more than 10 times a day makes you dumber than being stoned. When you’re stoned, your IQ drops by five points. When you multitask, it drops by an average of 10 points—15 for men, and five for women. It’s time to kiss your multi-tasking days goodbye, especially if you’re a man.via The Next Web.