Some of the ways that lie detectors have come on in leaps and bounds since the early 1900s include how they are used, how accurate they are, the technology used, and the contexts in which they are used too. William Moulton Marston invented the first lie detector in the 1910s.
It relied on detecting pulse rates, blood pressure, and breathing to determine whether someone was lying or not. These days, polygraph machines use algorithms and sensors to analyze all kinds of factors, such as skin response, heart rate, and more. Generally, today’s lie detectors are much more reliable than the ones used more than a century ago.
Humanity has developed many ways to navigate itself throughout history. One of the most ingenious inventions to make this possible is the compass. In the early 1900s, a typical compass would be made out of some kind of metal, with a needle suspended in the middle. The designs of these "gadgets" would usually be quite simple.
But they did their job in showing the user north, south, east, and west. These days, compasses aren't necessarily made out of metal. They can be found on laptops, smartphones, and other digital devices. As for manual compasses, liquid-filled versions became a popular substitute to the more traditional metal ones.
While versions of guitars have been played for thousands of years, we often associate this instrument with that modern "hourglass" design. In the early 1900s, and even before, guitars were built from traditional materials such as wood. And usually, they would be handcrafted. But nowadays, the exact same guitars can be produced by machines.
The electric guitar also rose in popularity during the rise of music genres such as pop, rock, heavy metal, and more. Generally, guitars of today are designed with an emphasis on optimized performance and comfort. But in theory, one could play the exact same tune on a modern guitar or one from the early 1900s.
While they might very much look the same as they did back in the early 1900s, soap has been through all kinds of changes since then. Originally, these items that we used to wash ourselves were predominantly made from vegetable oils or animal fats. These days though, soap can be made from other materials such as synthetic detergents.
Usually, the soap of yesteryear was handmade. But nowadays, soap can be produced en masse in industrial plants. The variety of aromas and scents of soaps is more varied now than ever before. Not to mention that soap can now come as foam, cream, and in other forms - not just as a bar.
Nowadays, there is a whole industry that revolves around diapers. They are some of the most widely bought commodities on the planet. But they were pretty different more than one hundred years ago. Diapers of that era would be made out of cloth, and would often be reused, rewashed, and redried.
Generally speaking though, parents of today resort to disposable diapers that are made out of materials such as polypropylene, polyethylene, and more. These materials have been proven to provide more comfort for the baby, and to better absorb liquid. And while today's diapers are problematic for the environment, many brands provide eco-friendly alternatives.