But in science, we have to keep track of both the hits and the misses. As an example of what happens if you don't, let's look at the case of the cursed football player.
Aaron James Ramsey is a Welsh footballer (or soccer player, as we'd call him here in the States) who plays for Arsenal and also for the Welsh national team. And a strange superstition has grown up around him -- that whenever he scores a goal, a famous person somewhere in the world dies.
On and on it goes. The "Ramsey curse" has been blamed for the deaths of basketball player Ray Williams, actors Paul Walker, Robin Williams, and Alan Rickman, and rock legend David Bowie. The demise of Nancy Reagan, screenwriter Bruce Forsythe, comedian Ken Dodd, physicist Stephen Hawking, and champion darts player Eric Bristow were all blamed on the Ramsey curse phenomenon.
Okay, so here's the problem.
According to his online statistics, Ramsey has had 32 goals in his professional career, but the article about the "curse" (linked above) says that only sixteen of them were followed by deaths of prominent individuals. So this is already giving the "curse" a 50% success rate.
But there are two other problems. First is how we're defining the word "famous." I don't know about you, but of the fourteen "famous people" I listed above that Ramsey has allegedly killed, I'd never heard of four of them -- Ray Williams, Forsythe, Dodd, and Bristow. No offense to darts enthusiasts, but even a champion darts player isn't quite in the same league as David Bowie. So if you're defining "famous" that loosely, you've got a big field to choose from.
Second, though -- can you find a date that didn't have a famous death somewhere immediately following it? There are so many people in the news, in sports, and in entertainment that there are bound to be deaths pretty much every week (especially if you have that broad a definition of fame). So in order to establish whether there really was a "Ramsey curse," we'd have to keep track of all of his goals and all deaths of famous people, and show that deaths were statistically more likely to happen closer to his scoring a goal.
As far as Ramsey goes, he (understandably) scoffs at the whole idea. "The most ridiculous rumour I’ve heard is that people die after I score. There have been loads of occasions where I’ve scored and nobody has died. That’s just a crazy rumour. I didn’t really find it funny. Although I took out some baddies!"
So anyhow, Arsenal fans don't need to panic every time Ramsey scores a goal. These kinds of coincidences are bound to happen -- and once someone notices them, they stand out, making them more likely to be noticed next time.
But if I'm wrong, I do wish he'd spared Stephen Hawking and Alan Rickman. Still haven't gotten over those, actually.
This week's Skeptophilia book recommendation is an entertaining one -- Bad Astronomy by astronomer and blogger Phil Plait. Covering everything from Moon landing "hoax" claims to astrology, Plait takes a look at how credulity and wishful thinking have given rise to loony ideas about the universe we live in, and how those ideas simply refuse to die.
Along the way, Plait makes sure to teach some good astronomy, explaining why you can't hear sounds in space, why stars twinkle but planets don't, and how we've used indirect evidence to create a persuasive explanation for how the universe began. His lucid style is both informative and entertaining, and although you'll sometimes laugh at how goofy the human race can be, you'll come away impressed by how much we've figured out.
[If you purchase the book from Amazon using the image/link below, part of the proceeds goes to supporting Skeptophilia!]