Safari Live - Day 121 | National Geographic

Why does fentanyl feel so good? Let us try it so you don’t have to. Fentanyl reaches your brain in seconds, and like other opioids, binds to opioid receptors. It stops pain signals and also releases a flood of dopamine, so the pain melts away as you slide…

So we have a type of statistical study described here. I encourage you to pause this video, read it, and see if you can figure out: Is this a sample study? Is it an observational study? Is it an experiment? And then also think about what type of conclusio…

Set a lot of people. They think UFOs and alien visits are the same thing. So what’s up with that? Well, I think that most people who are into the UFO phenomenon—and by the way, that’s not a small percentage—it’s one third of the public. One third of the p…

A set of middle school students’ heights are normally distributed with a mean of 150 cm and a standard deviation of 20 cm. Darnell is a middle school student with a height of 161.405, so it would have a shape that looks something like that. That’s my hand…

[Music] Ah, what a lovely weekend in the neighborhood. Susan is out walking the dog. Frank is hard at work writing his new book, and Billy is, ah yes, a classic Billy Saturday—waking up late, his mind filled with dread. There are so many things he could d…

The SAT prep are actually Mastery-enabled courses, and we’ll talk about what mastery enablement means in a second. But there are actually two different courses: there’s a reading and writing SAT prep course and a math SAT prep course. The content of both …