For the last week or so, on a physics blog I follow, I’ve been part of a debate about the nature of time. It’s been interesting and fun, but the conversation has reached that point where folks are mainly maintaining their positions, and it seems that the matter has stalled.
Some of the on-going assertions bemused me so much, that I was about to tender one more rebuttal comment… When I remembered what a wiser person, “back in the day” (before the web), said about online debates: State your view. Support it further if you need to address points raised. But once you’ve covered it well enough, just stop. After that, you’re just wasting your time; it’s rare that anyone changes their mind on the internet. Including yours.
Fair enough. I can natter on about it to myself on my own blog, though…
Where are all the aliens?
I’ve mentioned the Fermi Paradox here quite a number of times, but I’ve never made it the main topic of a post. Lately I’m becoming more and more convinced our world is facing a Great Filter, and that we may very well be seeing one answer to Mr. Fermi’s interesting paradox.
Which is a response to the Drake Equation, which I have made the topic of a post.
Essentially, the Drake Equation attempts to estimate the number of intelligent space-faring species in a galaxy and, by most accounts, comes up with a number noticeably larger than one. The Fermi Paradox says: Okay Mr. Drake… if so… where are all the aliens?
Well that didn’t take long!
Multiple news sources have reported on a two-year microbiology study out of Rutgers University (Is the five-second rule real?). The upshot is: Yes, of course it’s not real.
What strikes me is that anyone actually thought it was real. We (meaning pretty much everyone I ever associated with) always understood it as a bit of obvious irony, a self-serving excuse for eating fallen food. If asked, I would have said one would have to be a real idiot to think it was real.
Well,… can’t say I’m surprised.
On the one hand, global climate change is likely to make things very — strictly in the curse sense — “interesting” for the human race as this millennium progresses. The effects already are obvious, visual, striking, and — one would think — undeniable.
Randall Munroe, of xkcd, has created another of his brilliant graphics, this one showing the history of climate change. It’s well-worth checking out (do it now). It makes the point in a visually striking, and — one would think — undeniable way.
On the other hand, it’s very — in the usual sense — “interesting” that we’re here at all.
If you’re anything like me, you’ve probably spent a fair amount of time wondering what is the deal with tesseracts? Just exactly what the heck is a “four-dimension cube” anyway? No doubt you’ve stared curiously at one of those 2D images (like the one here) that fakes a 3D image of an attempt to render a 4D tesseract.
Recently I spent a bunch of wetware CPU cycles, and made lots of diagrams, trying to wrap my mind around the idea of a tesseract. I think I made some progress. It was an interesting diversion, and at least I think I understand that image now!
FWIW, here’s a post about what I came up with…
To the dismay of physics geeks everywhere, theoretical particle physics struck out at the plate this year. Three swings, three misses. (Well, maybe one wasn’t really a swing. More a taken ball the umpire called a strike.) It was a crushing disappointment for those of us hoping for a rule-change to the game.
On the other hand, cosmology geeks got three recent home runs, so there was victory (with more coming!) for those who peer at the big and distant. On the other other hand, none of those were game-changers either. (They were just, you know, awesome.)
Since I follow both physics and cosmology, win some, lose some.
In the last quarter of the 19th century — USA-centrically, call it 139 years ago — we began to experience having the sound of strangers’ voices in our lives, even in our homes. Not just voices, but music from concert halls and clubs. And other sounds, too: the clip-clop of horse feet, the slam of a door, a gun-shot. Less than 100 years go, those sounds went electric, and we never looked back.
At the beginning of the 20th century, we started another love affair — this one with moving images on rectangular screens, a dance of light and shadow, windows to imaginary worlds. Or windows to recorded memories or news of distant places. When sound went electric, those moving images took voice and spoke and sang. No one alive in our society today remembers a time when moving images weren’t woven into our lives.
Here, now, into the 21st century, in an age of streaming video and music, from cloud to your pocket device (with its high-resolution display and built-in video camera), I can’t help but be impressed by how far we’ve come.
A long way, indeed.
Well, it’s Pi Day once again (although this date becomes more and more inaccurate as the century proceeds). So, once again, I’ll opine that Tau Day is cooler. (see: Happy Tau Day!)
Last year, for extra-special Pi Day, I wrote a post that pretty much says all I have to say about Pi. (see: Here Today; Pi Tomorrow) That post was actually published the day before. I used the actual day to kick off last Spring’s series on Special Relativity.
So what remains to be said? Not much, really, but I’ve never let that stop me before, so why start now?
Credit where credit is due, both the major ideas in this post come from Fareed Zakaria on his CNN Sunday program, GPS. If you follow TV news at all, you know Sunday mornings have such long-running standards as Meet the Press (on NBC since 1947!) and Face the Nation (on CBS since 1954). (Or was it Meet the Nation and Face the Press?)
Zakaria is one of the good ones: very intelligent, highly educated, calm and measured. He’s well worth listening to. (I’ve realized one attraction to TV news is the chance to — at least sometimes — hear educated, intelligent talk. It’s a nice respite from most TV entertainment.)
Two things on Zakaria’s last episode really rang a bell with me.
It took almost exactly 100 years. In 1905, über-geek hero Albert Einstein presented four papers of major significance to the world. One of those was about Special Relativity. It took Einstein ten more years to figure out the General theory of Relativity. He presented that work in November of 1915.
One of the predictions of General Relativity is that gravity warps space, creating gravity waves (which move at the speed of light). And while many other predictions of GR have been tested and confirmed (to very high precision), we’ve never quite managed to detect gravity waves.
Until September 14th of 2015!