16 years of Skulls in the Stars!

Just a quick note that I’ve been blogging now for 16 years, as of today, as WordPress reminded me!

It’s wild that 16 years is almost 1/3 of my life that I’ve been writing this blog, and no plans to stop! This week, I’m prepping for my talk at the Natural Sciences Museum and then at Malaprop’s Cafe, so please check those events out if you want some content for me in the meantime.

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Invisibility talk at Natural Sciences at Raleigh!

Wanted to announce that I’ll be doing a Science Cafe at the North Carolina Museum of Natural Sciences this coming Thursday, August 17th, at 7:00 pm!

It will be both an in-person event as well as a livestream on YouTube, so I hope to “see” folks there one way or another! I’m putting together a new presentation on the history of invisibility, and hope to bring along some weird science demos to show off, so it should be fun!

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A “remarkable lightning stroke,” 1879

One of the fun things about reading early science journals and magazines is finding anecdotes about unusual phenomena that are sent in by readers and published. While I was writing my previous blog post about Tyndall and Mayer, I came across a letter in The Popular Science Monthly from 1879, simply titled, “Remarkable lightning stroke.” The letter, written by Robert F. Jackson, Jr. from Macon, Georgia, on May 20, 1879, is a fascinating lightning event, and I reproduce the letter in full below.

There recently occurred in our city a case of stroke by lightning which, no doubt, from its strange freaks, will be of interest to the readers of The Popular Science Monthly. It took place in a grocery store, and two persons were the sufferers. The bolt, after tearing up the eaves of the house, entered it on the side, leaving a smutty stain between the cracks. It bulged out the side of the shop for several feet, put out the lamp, knocked down many articles from the shelves, took off the tops of several lamp-chimneys resting on them, completely tore off the paper wrappers of many small cakes of soap, and finally emerged at the corner of the room, tearing off several planks. In the passage of the current from one division of the shelves to the other, it either split the dividing boards or passed under them, partially fusing the nails and charring the adjacent wood. But what makes the stroke most remarkable is the way in which it affected the two men who were struck. One of them, Ware, was stunned for a few moments, had his pipe knocked from his mouth several feet away, and was left with a red, sore scar across his cheek and a paralysis of his arms, which latter remained for about two hours. Still more strangely did it deal with the other man, Bullard, who was resting upon the show-case opposite Ware. The current passed up his arm, under the armpit, down the right side of the body to the thigh, leaped across to the inner side of the left leg, and passed down the leg to the foot. It made a red bunch and sore mark upon the body, singed the hair from both legs, and left the sufferer unconscious for more than twenty-four hours. Both have fully recovered, with the exception of a little soreness. In both cases we noted the spiral direction of the current. The house was low, in a depressed situation, and protected with a rod.

Lightning was an unending source of fascination for early pre-1900s researchers, and it seems that any story of a strange lightning strike could be published in the scientific journals. I have previously shared a story of an 1880 observation of ball lightning, and an article asking the curious question, “Are beech trees ever struck by lightning?” from 1889. This was not just a problem of scientific interest, of course, as lightning can kill, and famously killed one person researching it.

Lightning rods have mitigated much of the danger to buildings from lightning strikes, but still about 28 people die each year in the U.S. due to lightning, so it is still not to be taken lightly.

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Me on science writing in Optics & Photonics News!

A couple of months ago, the folks who run Optics & Photonics News at Optica, the optical society, asked if I could write a post for their “careers” blog about my path to writing popular science books. Well, the post is now published! I’m not sure if there’s a subscription wall or not to read it, but I wanted to share the info here either way.

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John Tyndall rescues Julius Mayer, 1862

I’ve been thinking again recently of the remarkable story of Julius Robert Mayer (1814-1878), the German physician and scientist who was the first person to truly discover the principle of conservation of energy. Most physicists associate James Prescott Joule with the discovery, though Joule in fact independently discovered the principle in 1843, a year after Mayer. I’ve written about Mayer’s life and work before in some detail, but today I wanted to focus on how Mayer’s life was nearly destroyed by political attacks on his work, and how he was saved by the truly outstanding and brilliant efforts of the Irish physicist John Tyndall in 1862.

Julius Robert Mayer, from a 1905 German biography by Dr. S. Friedlaender.

First, let me briefly review the background. Mayer began his professional career as a medical doctor in 1840, but instead of setting up a private practice right away he opted to travel as a ship’s doctor on a vessel heading to the East Indies. In that day, bloodletting was still an accepted treatment for illness, and Mayer was struck by the fact that the venous blood of the sailors was bright red while in Indonesia, much more like arterial blood.

Mayer realized that the blood was redder because less oxygen was being used to heat the body in the warmer climate. This observation got him thinking about processes of cause and effect, and how effects must pass down from one event to another, sometimes in a way that could not easily be recognized. This was the impetus for the discovery of the conservation of energy.

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Two new reviews of Invisibility!

Yesterday was quite the day for book reviews for my book on the history and science of invisibility! First, James Gleick wrote a very nice and thoughtful review of the book for the New York Review of Books; a screenshot for posterity is shown below.

The article requires registration to read, but you can register for free to do so. (I did.)

The second review appeared in Optics & Photonics News, the news magazine for my favorite optics organization, Optica. Again, here’s a screenshot:

This review was particularly glowing, and that makes me happy!

Just wanted to share; more science and fiction blogging to come in the near future.

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How fast can we communicate with light and radio waves?

I’m pretty forgiving about reading mildly inaccurate physics stuff, especially when it’s in science fiction stories, but every once in a while I read a real zinger that nearly causes me physical pain. Recently I was reading an article about Wi-Fi when I came across this paragraph:

This was in an otherwise fascinating article about how engineers are developing light-based Wi-Fi, called Li-Fi, which would in essence just be a lamp in your room that would communicate to your wireless device through a light sensor. Fluctuations in the light, undetectable by the human eye, would carry the information.

You can see why I was in pain from the first sentence: “Since light travels much faster than Wi-Fi radio waves, data speeds are significantly faster.” The problem with this is that, in air, the speed of visible light and the speed of radio waves are basically identical and equal to the vacuum speed of light.

I point this out not to pick on the author of the article — writers are very busy, and sometimes a sentence gets poorly worded or some concept non-essential to the story gets honestly misunderstood, and we’ve all made mistakes like that at some point. (You’ll notice I don’t even link to the article.)

But I thought it was a good excuse to ask and answer the question: what does determine the data speeds of our communications devices, and why is light a better option than radio? And if it is a better option, why haven’t we done it already? So let’s take a look!

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Posted in Optics, Physics | 4 Comments

70% off of Invisibility on Audiobooks.com through end of July!

Just a quick note: I lost track of this announcement when I first got it: my Invisibility book is 70% off in audio form at Audiobooks.com through the end of July. If you’ve been keen to get a copy in audiobook, this seems like a great opportunity.

I apparently get full royalties for all copies regardless of the discount, so feel free to indulge!

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Interview about Invisibility at Ars Technica!

A little more book news to tide the blog over until I write some new physics posts: around the time the book first came out, I was interviewed by Jennifer Ouellette for Ars Technica about the book, and that interview just came out today! You can read it at this link, or click on the image below.

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Virtual Invisibility book event at Malaprops!!!

Some more book news: I will be doing a virtual book event about my book Invisibility: The History and Science of How Not to Be Seen on Wednesday, August 23 at 6:00 pm EST!!!

The event is free but registration is required. I’m hoping to get a good audience for it so please consider attending and spreading the word! Also, if you haven’t gotten my book yet and would like to, please consider getting it through Malaprops, which is a great bookstore worth supporting!

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