my name is joe dolce and this is my brief but spectacular take on weed. >> woodruff: and you can findadditional brief but spectacular episodes on our website: pbs.org/newshour/brief. also online, we look at two potential medical uses for other "recreational" drugs. a synthesized version of the substance naturally found in hallucinogenic mushrooms shows promise in treating anxiety and depression in cancer patients. meanwhile, the f.d.a. approved further research into ecstasy as a treatment for post traumatic stress disorder. all that and more is on our website: pbs.org/newshour. >> sreenivasan: tonight on "charlie rose:" she has been called the joni mitchell of her generation, singer/songwriter regina spektor. and that's the newshour for tonight. on friday: one week after castro's death, our correspondent on the ground reports on cuba after fidel. i'm hari sreenivasan. >> woodruff: and i'm judy woodruff. join us online and again here tomorrow evening with shields and brooks. for all of us at the pbs newshour, thank you and good night. >> major funding for the pbs newshour has been prov