In only 23 years, the 21st century has already pumped out dozens of revolutionary, life-changing inventions. If you love your smartphone, social media, cryptocurrency, GPS navigation, online streaming platforms and e-cigarettes, you can be thankful that you’re living in this day in age. Personally, I have to say that my favorite invention from this century is the air fryer (seriously, don’t knock it until you try it), but I have to say that another invention that has changed my life is the…