Best invention? Internet. Totally changed my life in a radical way. No more hours spent in the library for information.
Other than that, I also love the fact that we can fly from one continent to another. Some time ago, people travel by ships and take months to get to some places. But now, almost everywhere is within 1-2 days. It is definitely life-changing, and it allows globalization to happen more rapidly. I like that we're getting products from all over the world... I believe that with these inventions, we are able to learn more about different culture, and in a way, it helps pave the way to more cultural learning and appreciation, and better relationships across countries.
Without Internet, it's not that easy to communicate with people across the world. I love it, and I am so happy to live in this world with all of its advances.