Samuel Clemens, known to most of us by his pseudonym Mark Twain, was born in Hannibal, Missouri on November 30, 1835, shortly after Halley’s Comet had made its regular but rare pass by the Earth. The 26-year-old Abraham Lincoln – an amateur astronomy buff who two years earlier had marveled at the Leonid meteor showers – may very well have been gazing at the skies when Mark Twain came into this world. At that age Lincoln lived in New Salem, Illinois, just a stone’s throw across the Mississippi River from Hannibal. In 1859, Lincoln rode the Hannibal and St. Joseph Railroad to give a speech in Council Bluffs, Iowa. The railroad just happened to be formed in the office of Mark Twain’s father thirteen years before.
Lincoln floated flatboats down the Mississippi River to New Orleans as a young adult, then took steamboats back upriver. He often piloted steamboats around shoals near his New Salem home. Mark Twain had worked on steamboats on the river for much of his younger years, first as a deckhand and then as a pilot. Being a riverboat pilot gave him his pen name; “mark twain” is “the leadsman’s cry for a measured river depth of two fathoms (12 feet), which was safe water for a steamboat.” In 1883 Twain even titled his memoir, Life on the Mississippi. As we have already seen, Lincoln’s time traveling on and piloting steamboats eventually inspired his patent for lifting boats over shoals and obstructions on the river.
Lincoln would not have read any of Mark Twain’s stories (his first, The Celebrated Jumping Frog of Calaveras County, was published in 1865, about seven months after Lincoln had been assassinated). But Twain says his humorous writing style was strongly influenced by another pen named-humorist, Artemus Ward, and the Jumping Frog story was published in the New York Saturday Press only because he finished it too late to be included in a book Artemus Ward was compiling. This is the same Artemus Ward that was so often read by Abraham Lincoln to break the tensions of the Civil War.
In fact, Lincoln was so entranced by the humor of Ward that on September 22, 1862 he read snippets from one of Ward’s books to his cabinet secretaries before settling into the business of the day – the first reading of the preliminary Emancipation Proclamation.
Ironically, Mark Twain’s piloting job ended when the Civil War started, as much of the Mississippi River became part of the war zone. So what is a writer/river-boatman to do? Well, join the Confederate army of course. His unpaid service lasted only two weeks in 1861 before disbanding. He then left for Nevada to work for his older brother, out of harm’s way for the rest of the war, though his brief service for the confederacy did give him material for another of his humorous sketches, The Private History of a Campaign That Failed.” Later, Mark Twain would publish the memoirs of Civil War hero and President, Ulysses S. Grant.
Like Lincoln, Mark Twain was very interested in science and technology. Twain actually had three patents of his own, for a type of alternative to suspenders, a history trivia game, and a self- pasting scrapbook.
Lincoln and Twain never met, but I think they would have gotten along famously.
David J. Kent is an avid science traveler and the author of Lincoln: The Man Who Saved America, in Barnes and Noble stores now. His previous books include Tesla: The Wizard of Electricity and Edison: The Inventor of the Modern World and two specialty e-books: Nikola Tesla: Renewable Energy Ahead of Its Time and Abraham Lincoln and Nikola Tesla: Connected by Fate.
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Nikola Tesla spent much time learning to exert self-control over his will. Once an addicted gambler, he worked hard to rid himself of that destructive desire. Not leaving a trace of desire apparently extended to his views on marriage and celibacy.
“Many a deluded inventor has spent years of his life in endeavoring to harness the tides.” – Nikola Tesla
In 1882, Nikola Tesla’s time in Budapest was coming to an end. His close relationship with the Puskas brothers led him to Charles Batchelor, who was Thomas Edison’s man in Paris. Batchelor was an Englishman and mechanic supreme, having learned his trade in the textile mills of Manchester. But Batchelor was more than just a good technician; he was a natural salesman and organizer. Nearly single-handedly he had overseen the spread of Edison’s direct current system across Europe, mostly as isolated power plants for individual factories, hotels, shipyards, and railroad stations. This highlighted the big problem with direct current—it was limited to low voltages and could not be transmitted more than a short distance. Direct current power plants had to be installed every mile or so to light up a city, a logistical problem that meant despite his sales skills Batchelor was only able to install three central power stations, one each in the cities of Milan, Rotterdam, and St. Petersburg.
According to the Library of Congress’s Abraham Lincoln and Civil War expert Michelle Krowl, and quoting from the book On These Walls: Inscriptions & Quotations in the Library of Congress
During his illustrious scientific career, Nikola Tesla developed many inventions that changed the world, including his unique design for a rotating magnetic field motor that enabled the use of alternating current on a commercial basis, wireless communication across vast distances, and even early “shadowgraphs,” precursors to X-rays. He also made forays into areas that, while he did not succeed in commercializing, set the stage for future developments, including wireless remote control of boats and other devices (robotics). Tesla did make some grandiose claims that did not come to fruition, the biggest of which included the wireless transmission of power through the Earth, plus a directed energy weapon. He also claimed to have communicated with intelligent beings from the planet Venus or Mars.
When he was not 
Tesla had begun working on bladeless turbines when he was consulting with the Westinghouse Company in Pittsburgh, but this project, like so many others, was put on hold while he toiled on his alternating current designs of high potential and high frequency. But in 1906 he gave himself a fiftieth birthday present by demonstrating his bladeless turbine in public. The basic design of the turbine relies on the principle of boundary layer flow, that is, where the movement of the liquid or gas passes over a series of smooth disks. Some of the liquid or gas adheres to the disks, which creates a vortex that spirals toward the center and spins the turbine. Tesla described it in an interview with the New York Herald in 1911:
