OK - here is the 23rd year of the card I first posted in 1994 ...
The drawing came together in about a minute. The music was done in midi editing with a keyboard looking at a score and took much longer. I put it on a server running on red net (a link outside our corporate firewall) under my desk and sent the link to readers of The Crandall Surf Report - an early pre-blog I wrote in the Mosaic era.
I didn't think much of it until the second year when people started bothering me to re-post it. Dozens of people. One thing led after another and it is closing in on a quarter century..
The current server, and I think this is the fifth, no longer supports midi and I was forced to convert it to mp3. No autoplay, so click on the player for the music. So much for authenticity.
anyway ... whatever your holiday, have a good one!
This has been hypothesized and weakly observed, but now some serious evidence. The paper in Nature (behind their paywall, but probably for physicists who tend to get Nature)
Photonuclear reactions triggered by lightning discharge
Lightning and thunderclouds are natural particle accelerators1. Avalanches of relativistic runaway electrons, which develop in electric fields within thunderclouds2,3, emit bremsstrahlung γ-rays. These γ-rays have been detected by ground-based observatories4,5,6,7,8,9, by airborne detectors10 and as terrestrial γ-ray flashes from space10,11,12,13,14. The energy of the γ-rays is sufficiently high that they can trigger atmospheric photonuclear reactions10,15,16,17,18,19 that produce neutrons and eventually positrons via β+ decay of the unstable radioactive isotopes, most notably 13N, which is generated via 14N + γ → 13N + n, where γ denotes a photon and n a neutron. However, this reaction has hitherto not been observed conclusively, despite increasing observational evidence of neutrons7,20,21 and positrons10,22that are presumably derived from such reactions. Here we report ground-based observations of neutron and positron signals after lightning. During a thunderstorm on 6 February 2017 in Japan, a γ-ray flash with a duration of less than one millisecond was detected at our monitoring sites 0.5–1.7 kilometres away from the lightning. The subsequent γ-ray afterglow subsided quickly, with an exponential decay constant of 40–60 milliseconds, and was followed by prolonged line emission at about 0.511 megaelectronvolts, which lasted for a minute. The observed decay timescale and spectral cutoff at about 10 megaelectronvolts of the γ-ray afterglow are well explained by de-excitation γ-rays from nuclei excited by neutron capture. The centre energy of the prolonged line emission corresponds to electron–positron annihilation, providing conclusive evidence of positrons being produced after the lightning.