Skip to content
The Daily Triptych290 / 365

17 OCT 2026

Day 290

What we observe is not nature itself, but nature exposed to our method of questioning.

Werner Heisenberg · Physics and Philosophy
An oil painting on canvas of fur traders travelling by boat on a broad, quiet river, with low banks and a calm horizontal expanse of water and sky.

I · THE OBJECT · BRITISH MUSEUM

Fur Traders Descending the Missouri

United States · 1845 · Oil on canvas

George Caleb Bingham’s 1845 river scene of fur traders on the Missouri, now at the Metropolitan Museum of Art, fixed a vanishing way of life in oil before the steamboat remade the West.

Enter lesson 6 MIN
Three small mounds of powder on a white surface: pale yellow sulfur, black charcoal, and white crystalline potassium nitrate, the three components of gunpowder.

II · THE DISCOVERY · HISTORY OF SCIENCE

Gunpowder

known since roughly the 9th century · sulfur, charcoal, potassium nitrate · low explosive

A mixture of three powders combined into something that could propel a cannonball without shattering the barrel. It burns subsonic, which turns out to matter.

Enter lesson 6 MIN
A darkened interior lit by a strong central light. A man stands over a glass air pump containing a pale bird, surrounded by men, women and children whose faces show curiosity, distress and attention.

III · THE WORK · ART HISTORY

An Experiment on a Bird in the Air Pump

Joseph Wright of Derby · 1768 · Oil on canvas

In a darkened room a bird falters inside a glass vessel while a mixed company watches. Wright gives the scene the gravity once reserved for scripture and history.

Enter lesson 6 MIN
Head-and-shoulders portrait of a man in a white baseball uniform with blue and orange piping, a white cap with an orange brim, holding a bat and looking directly at the camera.

IV · THE GAME · MAJOR LEAGUE BASEBALL

Reggie Jackson

Outfielder · 9 June 1967 · Kansas City/Oakland Athletics · Baltimore Orioles · New York Yankees · California Angels

Jackson hit forty-seven home runs in 1969 and never reached that mark again. The other five hundred and sixteen arrived in smaller batches across two decades.

Enter lesson 6 MIN

The daily email

Four lessons in your inbox, every morning at seven.

One object, one idea, one masterpiece, one game. Deep links to that day’s pages. Unsubscribe with one click, any time.