matt o'brien, thank you for coming in. >> thank you. >> this is going to be a key issue in the weeksths to come. >> thank you. >> anne, a shooting yesterday where tons of thousands of people were gathered in colorado. we'll tell you what caused a major panic for a festival for marijuana enthusiasts, stay tuned. ,,,,,,,,,,,, medications? i don't know. last immunization shots? really? honey, what's my blood pressure medicine called? one time i took something and i blew up like a puffer fish. i'm probably allergic to that. at kaiser permanente, your medical information is available to you and your doctors. quickly. securely. no guesswork required. better information. better care. kaiserpermanente. thrive. ent has been c . >>> things turned so ugly at a marijuana festival in colorado, the rest of the weekend event has been canceled. an estimated 80,000 people were on hand in denver yesterday when gunfire broke out. two humans and a dog were injured and the panicked crowd scattered. the gunman got away. >>> an annual marijuana event in downtown san jose is proving to be much more peaceful

we had a writer, matt o'brien, who wrote a piece basically saying, this isn't a currency, it's a techt pets.com or paypal? and in addition to being clever because it was ill lwrittive. when you transfer money from paypal, the friend has the expectation the transfer will be $100. but a pets.com kind of stock, where you invest one day and look at your portfolio one month later and you realize you've either lost 50% or gained 200%, this isn't a currency. this isn't something that people, in the real world will want to buy, will want to use as a means of exchange. >> you know, it's very easy to be cynical, but if you take the winklevoss twins, who have one of the largest bitcoin portfolios out there, they say this is just teething pains. this is what happens when you've got like the nascents of a currency or anything else, it's going to go through a bit of a bumpy patch. is there any cred to that? >> sure, there might be cred to that. i can't predict the future, and it's certainly possible this could turn out to be a currency whose value stabilizes and people really use. one thing we've s