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Old Grog

The word “grog” comes from the British Navy. In 1740, naval officer Captain Edward “Old Grog” Vernon—nicknamed for his grogram cloak—ordered sailors’ rum rations to be diluted with water to reduce drunkenness. Sailors began calling the mix “grog” after him.

Over time, grog came to mean any alcoholic drink. The word groggy—meaning unsteady—also comes from sailors who had too much grog.

* This topic has been previously featured. Spaced repetition improves your learning by helping you retain information for longer.

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Flat Earth? Here are the easiest real-world checks

If the Earth were flat, everyday observations would behave very differently. Start with the ocean: ships don’t just “shrink” into the distance — they disappear bottom-first as the horizon blocks the hull before the mast. Then look up: the night sky changes with latitude.

Want a DIY proof? Try the classic Eratosthenes experiment: measure a vertical stick’s shadow angle at the same time in two different cities. The angles won’t match, and the difference is precisely what you’d expect on a sphere. You don’t need NASA — just geometry, sunlight, and a tape measure.

Hydrogen “Batteries” (Fuel Cells)

Hydrogen fuel cells are often pitched as the next big leap because they can deliver electric-style driving and power with fast refuelling and long range, which is especially attractive for heavy-duty transport and other “hard-to-electrify” uses. The catch is that hydrogen is less an energy source and more an energy carrier—and right now, making clean hydrogen at scale is still expensive, with low-emissions hydrogen only a tiny slice of global supply.

The difficulties are mostly practical. Storage and transport are brutal: hydrogen has low energy density by volume, so it needs high pressures, very cold temperatures, or specialised chemical carriers—all of which add cost, weight, and complexity. Then there’s the infrastructure gap: producing, moving, and dispensing hydrogen requires a new network of plants, pipelines/trucks, and refuelling stations, and many projects have been delayed because customers won’t sign long-term contracts at today’s prices.

Pit Stop

Formula 1 pit stops can be completed in under 2 seconds, faster than it takes you to read this sentence.

* This topic has been previously featured. Spaced repetition improves your learning by helping you retain information for longer.

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Top 5 Systems of Government: Now and In the Past

Anime as an Art Form

Anime treats animation like cinema—using composition, colour, timing, and sound to tell stories with real emotional weight. Its style ranges from minimalist linework to painterly, highly detailed backgrounds, often drawing on illustration, graphic design, and film storyboarding. Even “limited animation” becomes a creative choice: a held close-up or perfectly timed cut can be more powerful than constant motion.

Song Parodies: Familiar Tunes, Brand-New Punchlines

A song parody takes a well-known track and swaps in new lyrics—usually for humour, satire, or commentary—while keeping the original melody (and often the overall structure) intact. The magic is that your brain already “knows” the song, so the rewritten lines land faster and harder, whether it’s poking fun at pop culture, everyday life, or the artist themselves.

Most well-known example: Weird Al Yankovic — “Eat It” (parody of Michael Jackson’s “Beat It”). Watch it here

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