Category: Highlights

Posted on
by

Venus and Mercury

I walked out of the office building this evening and just stopped. There, framed by the treetops along the street and the awning and wall of the next building over, was clearly Venus, which I hadn’t seen in months (since the last time it was visible in the evening), and below it a pinprick that, unless I’m mistaken, was Mercury (which I’ve only ever seen on a handful of occasions). It’s certainly in the right place, and I waited to see if either light would move (there’s an airport literally across the street) before deciding that they were both planets.

A few minutes earlier, Mercury would have been too faint. A few minutes later, it would have been below the trees. Not long after that, Venus would have been too low to see as well.

Update! The next two nights were too cloudy to see anything, but Friday evening I was able to spot them again! You can really see how much Mercury has moved relative to Venus in just three days.

Venus and Mercury 2

Update 2! And here’s the view the following Tuesday, one week after the first shot. I had to move to the left a few feet since they were behind the building now, which is why the light pole is visible this time. In retrospect, I wish I’d snapped it in all three shots, because that way I’d be able to make sure I was presenting them all at the same zoom level. I’ve been eyeballing it, and I think it’s close enough to get the idea across.

Venus and Mercury 3

Posted on
by

You may never seen a halo around the sun or a sundog next to it, but they’re actually quite common. You just have to look up. (Just don’t stare at the sun!) I usually keep an eye out for sun halos whenever there’s a thin cloud layer, since there usually aren’t ice crystals near the ground in LA, but the upper atmosphere is a lot colder.

I actually wasn’t looking for this halo. I just happened to look up toward the tree across the street and *wham* – there it was.

Just one day later, I saw a fainter halo while walking to lunch…and noticed this rainbow-like sundog off to the right of the sun. I tried to take another shot with my sunglass lens in front of the phone, but fumbled it, and by the time I fixed the settings, it was gone.

You don’t even have to be outside — a few weeks ago I posted a view through an office window. But you do have to look up once in a while!

Posted on
by

Here’s a fascinating look back at the spam wars by former Gmail spamfighter Mike Hearn.

I was involved for most of the previous decade as (among other things) the email admin for a small ISP. We used a mix of public blacklists, a private blacklist, virus filtering, SpamAssassin with both shared rules and local custom rules, and various other tools all tied together, some at the Sendmail level and the rest through MIMEDefang. It worked tolerably well, though of course it wasn’t perfect. I find it amusing that Gmail declared victory on spam in 2010, the same year that I changed jobs to a position that was more software developer and less sysadmin.

Privacy is a growing concern these days, so he also talks about the impact that widespread end-to-end email encryption would have on spam fighting. If you’re the mail handler, you can’t filter on, say, links found in the message, or characteristics of the writing or formatting, or anything else in the content. You can’t even run statistical analysis on all known spam and non-spam to see which the new message fits better. All you can do is look at where it came from and where it’s going.

Moving the spam filter to the client lets you do content filtering on your own mail, but you can’t take advantage of the larger volume of data that an ISP can, which means your filtering isn’t going to be as effective. And if your main email client is your phone, that’s really going to slow it down — and chew up battery.

Encrypting more of our communication is probably the way to go, but we’ll have to come up with new approaches to some previously-solved problems like this.

It got me thinking: Most of us not only accept that our email providers will look inside our mail to filter spam and viruses, we expect it. That’s weird. The idea of the post office looking inside our letters is so abhorrent that even tracking programs raise concerns. The idea of an actual person reading our email in transit creeps us out. Many people have problems with the idea of automated systems (like Gmail) reading our email for purposes of targeted advertising. But spam filtering? We get upset if it’s not happening!

That says something interesting about our priorities, and about how big an impact unfiltered spam has on our email.

Via ma.tt.

»All pages site-wide with this tag