When I visited Alaska in June one of the highlights of my trip was seeing a number of large whales while visiting Seward on the Kenai peninsula. It was a total Tourist Moment and I was OK with that. The fact that humans can see whales at all today is something of a miracle; only luck and good timing allowed most of the major species to make it out of the 19th Century without being hunted to extinction.
Why was killing whales so profitable? It turns out that people don't like sitting around in the pitch dark and prefer to have their homes and community spaces lit. Despite what we might imagine, candles played a minor role in lighting homes and certainly weren't used for things like street lighting. Turn off every electrical device in your home and light a couple candles; try reading something at night this way. It doesn't work terribly well, does it? Whale oil was a substantial step up, offering the advantage not only of a brighter, steadier light but one that could be burned indoors without marking everything in the home with soot or slowly poisoning the inhabitants. With natural gas uncommon until the era of the automobile, whale oil was the gold standard. So in the 19th Century we killed a lot of whales. Like. Almost all of them. So that we could light lamps at night.
People who like animals should mark their calendars with the birthdate of a Canadian geologist named Abraham Gesner (May 2) who in 1846 developed a process to distill a liquid fuel from low-grade coal. It was cheap as hell to produce and burned even steadier and brighter than whale oil. For reasons unknown he named it "Kerosene", and every whale on the planet breached the surface simultaneously to say "THANKS ABE!" Whaling continued but declined.
The problem remained, however, of providing a truly bright light. Until electricity and suitable light bulbs were developed it was hard to produce anything more than, well…if you've ever used a gas lantern you know what you're dealing with. It's nice. It's better than a candle. But it's not really bright bright. Actually, brighter artificial lights could be produced but only via processes that were dangerous, difficult, expensive, or all three. The most popular was invented in 1820 by a Briton named, I shit you not, Goldsworthy Gurney and involved a small flame fed by oxygen and hydrogen directed at a lump of Calcium Oxide, aka quicklime or simply lime. Commonly called Drummond Lights (after an early developer of the process) or calcium lights, they were staggeringly bright (even by modern, electrified standards) but had to be attended at all times. They burned extremely hot and, you know, started a ton of fires. However, in applications in which they could be monitored they were quite popular. Lighthouses, for example, used them to great effect.
Another popular application was in theaters, where an extremely bright light was useful, when directed properly, in drawing attention to the featured performer on stage. And that is why to this day celebrities and other people on the receiving end of intense media attention are said to be "in the limelight."
And now you know that. It's a whale of an anecdote.