A collection for the incurably curious.
A change of direction
Why would an airport repaint a runway that hasn’t moved?
Same strip of tarmac.
A different number.
Show me why
Magnetic north moved. The runway stayed put.
Runway numbers generally describe their direction relative to magnetic north, rounded to tens of degrees. Tampa’s January 2011 notice changed 18R/36L to 19R/1L as part of a renumbering prompted by magnetic drift.
A historical example, not today’s flight information. Renumbering follows coordinated updates; it does not happen automatically whenever a compass reading changes.
184° → 186°. Runway 18 → 19.
The pavement stays in exactly the same place.
Orange arrow: magnetic north. N: true north.
Heading scale below the runway is magnified.
January 2011 example · Checked 2026-10-05
The receipts
Tampa International Airport’s January 2011 designation notice and the FAA magnetic-heading convention.
Runway designations are labels, not counts. Any future 184° → 186° illustration must be labeled hypothetical; no Tampa angle is inferred.
April 1, 2020 Census
How many states combined have fewer people than California?
State borders shape representation in the Senate. Population alone doesn’t tell you how many seats a group of residents is represented by.
Show me
Further than five: the 21 least-populous states fit below California’s 2020 resident total.
More than fifteen: it takes the 21 least-populous states to get just below California’s 2020 resident total.
You got the population comparison. Now look at the seats those states are allocated.
Resident population
California
39,538,223residents21 states combined
37,174,921residentsShared scale: 0–40,000,000 residents. April 1, 2020 resident counts. The second bar is the combined population of 21 states.
Nearly the same population. A very different number of seats.
Senate seats
California
21 states combined
One chair represents one allocated Senate seat, not a current officeholder. Counts: 2 for California; 42 for the 21-state group.
Both measures, side by side. Different units; separate scales.
See the numbers
| Measure | Group | Value | Unit |
|---|---|---|---|
| Resident population | California | 39,538,223 | residents |
| Resident population | 21 states combined | 37,174,921 | residents |
| Senate seats | California | 2 | seats |
| Senate seats | 21 states combined | 42 | seats |
The 21 least-populous states, combined. They get 42 Senate seats. California gets 2.
In the 2020 Census, California had 39,538,223 residents. The 21 least-populous states had 37,174,921 combined—about 2.36 million fewer. Those states are allocated 42 U.S. Senate seats; California is allocated two.
This compares resident populations and allocated Senate seats using a fixed 2020 snapshot. It is not a count of eligible voters, a current population estimate, or a measure of an individual vote’s power. House representation follows a different system.
Checked 2026-10-04 · Data: April 1, 2020 Census
The receipts
California versus the 21 least-populous U.S. states in the April 1, 2020 Census. Ranked among the 50 states; D.C. and Puerto Rico are excluded because this comparison concerns state Senate representation.
Rank the 50 states by 2020 resident population and sum ranks 50 through 30: Wyoming, Vermont, Alaska, North Dakota, South Dakota, Delaware, Montana, Rhode Island, Maine, New Hampshire, Hawaii, West Virginia, Idaho, Nebraska, New Mexico, Kansas, Mississippi, Arkansas, Nevada, Iowa, Utah. Their total is 37,174,921; California has 39,538,223. Adding Connecticut, the next state, brings the total to 40,780,865, exceeding California. Thus 21 is the largest group of least-populous states whose combined population is below California’s. Seat allocation: 21 × 2 = 42 versus 1 × 2 = 2. The population bars share a zero-based 0–40 million resident scale. The seat objects use a separate literal count: one chair per allocated seat.
Denominator: Resident totals for California and the combined 21-state group, not eligible voters. Seat counts are allocated seats for each group: one state versus 21 states. No individual voting-power ratio is calculated.
Could your ears make a chip seem fresher?
One recording, two sound treatments. Listen if you like, then see what happened in the experiment.
No sound? The answer works without it.
Sound only plays when you tap Listen.
An illustrative sound comparison. Listening alone does not recreate the experiment.
Yes. Sound changed how fresh the chips seemed.
Your ears help decide how fresh a chip seems.
Researchers changed the biting sounds people heard through headphones. With louder or enhanced high-frequency feedback, the chips seemed crisper and fresher.
In informal questions after this small 2004 experiment, 15 of 20 participants thought the chips came from different packages. They came from the same package. This is not a population estimate or a test of actual freshness.
The crunch is part of the experience.
In our comparison, A softens high frequencies and B emphasizes them. Both use the same recording. Your reaction may differ.
The receipts
Zampini & Spence, Journal of Sensory Studies (2004) ↗
The experiment manipulated auditory feedback during biting. The 15-of-20 package response is reported in the discussion, p. 357, as informal post-experiment questioning. It is not a population estimate or a measure of food freshness. Oxford abstract ↗. Our two clips are filtered versions of a separate CC0 recording by Joseph Sardin ↗, not study recordings. The chip image is generated.
Next, a little pocket deception.
Keep wandering ↓Which one has
more copper?
Pick a coin. Or go straight to the answer.
The nickel. And it’s not even close.
as much copper.
In the silver-looking one.
A penny is copper-coated zinc.
A nickel is 75% copper.
one nickel
sixty pennies
Equal copper mass. Not equal spending money.
The receipts
U.S. Mint specifications ↗
Penny: 2.5 g × 2.5% = 0.0625 g copper. Nickel: 5 g × 75% = 3.75 g copper. Ratio: 60. Based on rounded specifications, not individual coin measurements. The coin collection compares copper content, not face value or total coin mass.
the mail has legs.
The last
9miles.
For Supai, home of the Havasupai people, the mail’s final leg is a mule train.
Special delivery. Four-legged edition.Getting there is
only half the trip.
Three hours down the canyon.
Five hours to climb back out.
A longer journey home.
10–22 mules. Five days a week.
The receipts
USPS Postal Facts, May 2026 ↗
USPS reports the nine-mile route, mule count, delivery days, and three-hour descent/five-hour return. Each mark represents one hour; playback is accelerated. The mule is an illustration.
Let’s get very, very close.
One pixel.
0.005 mm of paint.
Scroll from the whole painting into a single square millimeter.
Start with
the whole thing.
The Night Watch, by Rembrandt. There’s a lot to look at. We’re heading for a very small part.
Overview reproduction
1 mm × 1 mm
This tiny patch.
40,000 pixels.
At the museum’s image resolution, 200 pixels fit along each edge. That’s 200 × 200.
Enlarged scale diagram begins here.0.005 mm × 0.005 mm
And this?
One pixel.
Each pixel in the museum photograph represents a patch of paint just five thousandths of a millimeter wide.
Magnified diagram, not a paint photograph.A very big photograph.
For very small details.
717 billionpixels in the photograph
8,439photographs stitched together
The zoom moves from an overview reproduction to mathematical diagrams. It does not display the museum’s full-resolution scan.
The receipts
Rijksmuseum, January 2022 ↗
The museum reports 717 gigapixels, 8,439 photographs, and 0.005 mm per pixel side. Calculation: 1 ÷ 0.005 = 200 pixels per edge; 200 × 200 = 40,000 per square millimeter. Overview reproduction via Wikimedia Commons. The diagram colors do not represent sampled paint.