Science and Nature
Natural and formal sciences: physics, chemistry, biology, earth science, and mathematics.
#5797: How Many Nuclear Tests Have There Really Been?
Three credible sources, three different numbers — and the gap isn't new explosions. It's what each one decided to count.
#5795: Digging Harbors with Nuclear Bombs: Project Plowshare
From Sedan's 104-kiloton crater to a plan for 520 bombs in the Negev — how the atomic age tried to become civil engineering.
#5794: Starfish Prime: When the US Nuked Space
In 1962, the US detonated a 1.4-megaton warhead 400 km above the Pacific. The sky turned green for 90 minutes.
#5792: Tsar Bomba: The 50-Megaton Test That Shook the World
In 1961, the Soviets dropped the largest bomb ever built — a weapon with no military purpose, designed to be seen.
#5789: Build First, Ask Later: Hermits Who Dug Cathedrals
No permits, no blueprints, no training. Two categories of builders who did the unreasonable — and what they share.
#5776: Why UV Epoxy Keeps Curing in the Dark
UV epoxy isn't the same as craft-store UV resin — and its acid-based cure keeps working long after the light goes off.
#5767: Inside Private Grids That Run Themselves
From hospital CHP plants to remote mines, private grids already run like miniature utilities. Here's where the fence line sits.
#5761: Why You Shouldn't Dremel Your Antique Silver
A rotary tool removes metal in seconds that took a century to form. Here's what museums do instead — and why shine isn't the goal.
#5758: Why Your Outlet Is 120 Volts and Europe's Is 230
The US isn't really a 120-volt country — it's 120/240 split-phase. Here's the engineering logic behind the numbers on your panel.
#5757: Why the Grid Still Runs on AC When DC Won
Every reason AC beat DC has been overturned by power electronics. So why is your wall socket still AC?
#5749: From Sand to Trillion-Dollar Chips: Semiconductors in 5 Levels
A bad conductor and a bad insulator — and the most important material in civilization. Semiconductors explained in five escalating levels.
#5747: Jamming Drones: The Physics of the Wearable Skylock Kit
How does a vest-sized jammer take on frequency-hopping drones? The inverse-square law, spread spectrum, and why jamming reaches farther than detect...
#5745: Why Europlugs Fit Israeli Sockets So Badly
A 2.5-amp plug, a 16-amp socket, and half a millimeter of interference. The physics of a connection that was never meant to hold.
#5741: The Bulb That Lit the 20th Century
From Edison's carbon filament to the blue LED that unlocked white light — how we got from 1 lumen per watt to 150.
#5740: Your Vacuum's Best Upgrade Is the Head
Most people use 30% of their vacuum's capability. The cheapest fix isn't a new machine — it's the nozzle on the end.
#5737: Why Measuring a $4 Spudger Tip Is Weirdly Hard
A listener wants to put a number on his spudger's tip thickness. Turns out that's a real metrology problem.
#5730: What 4 Gs Actually Does to a Body at 17,000 Feet
A cockpit door left open, a passenger who knew one thing, and two off-duty pilots in row 30. What the physics of that descent really felt like.
#5729: Why There Are 1,500 Kosher Certifications
One product, three seals, and no way to tell which is "the" kosher one. How a single biblical sentence became a 1,500-agency industry.
#5720: Active, Passive, and the Speaker That Lied to Daniel
A rented PA speaker turns out to be mislabeled, and untangling why reveals the real difference between active and passive — plus what mic and line ...
#5717: What It Takes to Land on the Moon Again
Artemis II flew by the Moon in 2026. Artemis IV plans to land in 2028. The gap between those two missions is enormous.