In lightning and a static shock — is it photons, or electrons? And underneath that: is everything in the universe, matter included, just states of energy?

Isn't a white hole just a black hole running in reverse — and could our universe be the Hawking radiation of an enormous one? Two attempts to get a beginning out of time-symmetric physics.

How large is the black hole at the center of the galaxy, and how can a collision a billion light-years away move anything here? Following a guess that the answer had to be solar-system sized.

Everything with a front and a back is a worm with extensions. What that body plan is, how a small set of reused genetic switches builds it, why a whale shows it better than anything alive, and where the picture is still unsettled.

Why macOS only allows one VPN at a time, and two real ways to run Tailscale and Cloudflare WARP together.